CBP Form 28 Request for Information: A Warehouse Manager's 30-Day Response Playbook

It was a Tuesday morning in November 2024, just after 7 a.m. Peak season. Three container trucks were already lined up at our dock doors. My phone rang — our customs broker, voice tight: "Chen, that lamp shipment from last week — CBP just issued a Form 28. Thirty days to respond with classification and valuation documents."

My first reaction was honest: what does this have to do with the warehouse? You're the one who filed the entry. He sighed. "I filed it, sure. But the goods are in your building. The photos, the receiving records, the SKU-to-entry mapping — that's all in your system. Half of what CBP wants has to come from you."

That was the morning I actually learned what a CBP Form 28 Request for Information is. If you run a warehouse that handles import freight, your turn is coming. Here's what my tuition cost me.

What a Form 28 really is, and who runs the response

Let me untangle the concept first, because confusion is where the clock runs out. A CBP Form 28 is a formal request from U.S. Customs asking the importer to back up something on the entry — classification, value, country of origin. CBP can raise questions any time before liquidation, and here's the part most people miss: CBP has roughly 314 days after the entry is filed to challenge it. The goods are long sold, the money's collected, and Customs can still reopen the books. Keep your records at least that long.

Who leads? My hard-earned answer: the importer owns the liability, the broker runs the play, and the warehouse is the armory. The response letter is drafted and filed by the broker, but the evidence CBP asks for — carton markings, receiving photos, the SKU mapping, actual quantities received — lives in the warehouse. If the warehouse drags its feet, the other two can't save you.

The lesson that cost us $43,000: when Form 29 shows up

September 2023. A small-appliance client, freight through the Port of Long Beach. CBP issued a Form 28 questioning the classification of a humidifier — filed under one heading, CBP suspected it belonged under another with a materially higher duty rate.

The client treated it as routine paperwork. Two weeks passed before the document request even reached the broker. The broker asked us for receiving photos and the SKU mapping; we were in peak season and sat on it for another week. The 30-day window closed. CBP issued Form 29, a Notice of Action — essentially the verdict: liquidated at CBP's classification and rate.

That shipment was worth about $120,000. The higher rate cost an extra $43,000 in duties. The client's owner yelled at the broker and at me in the same phone call. And here's the bitter part — the classification might have been defensible. We lost because we never submitted the evidence in time, so CBP ruled on the worst assumption.

Burn this into memory: Form 28 says "explain yourself." Form 29 says "I've decided for you." Ignore the 28 and the 29 follows; once it does, you're liquidated at the highest plausible rate, and unwinding it means a formal protest — expensive and slow.

The 72-hour evidence sprint: how we beat one

After that loss, May 2024 brought another Form 28. This time CBP questioned valuation — declared prices on a batch of LED strip lights looked low, and they wanted purchase contracts, payment records, and proof the buyer and seller weren't related parties.

This time we played it differently. The broker called, and I started a 72-hour countdown in the warehouse:

Day one: IT pulled the full receiving history for that entry — dates, carton counts, SKUs, markings. The floor team dug up the inbound photos. Our standing rule is three photos at receiving (full pallet, carton marking, open-box inspection). That rule saved us.

Day two: I sat down with the client's purchasing team and walked the SKU-to-entry-description mapping line by line. Peak season means hundreds of SKUs — mislabeling one line is how you hand CBP a gift.

Day three: evidence package to the broker, response letter drafted, filed on day five — 25 days of cushion left.

Two weeks later, CBP closed it out as filed. Our broker told me our turnaround was in his top three. I told him the last one cost us $43,000 in tuition.

The response timeline: our warehouse SOP now

This is written into our SOP now. Every new supervisor learns it in week one:

A few things that matter: 30 days is the standard window, but you can usually get an extension — don't tough it out silently; file early, around day 20, so a supplemental request from CBP doesn't blow the deadline; archive every email and filing receipt until well after liquidation.

We also semi-automated the armory part: our WMS now builds an "evidence packet" per import entry — inbound photos, markings, and the SKU mapping filed under the entry number automatically. A supervisor types the entry number and exports the packet in ten minutes. Those hours saved go to the broker for writing a better response letter.

The counterintuitive truth about Form 28

Here's the part most warehouse people get backwards: Form 28 isn't an investigation of the warehouse — it's a challenge to the importer's declaration, and the warehouse is a supporting actor. But the supporting actor decides the outcome. Roughly 80 percent of what CBP asks for is physical-world evidence: what the goods look like, what the cartons say, whether the quantities match. The broker only has paper. Your photos and system records are the hard evidence.

And one blunt opinion: don't pick your broker on price alone. A Form 28 response is a writing and relationship job — how the letter is argued, how evidence is indexed, how the broker reads the port director's mood. Our guy numbers every exhibit and answers every question point by point; Customs can tell he's a professional. Saving a few hundred dollars on brokerage fees and fumbling a response costs tens of thousands in duties.

The worst case: penalties under 19 U.S.C. 1592

The scary part, but it has to be said. If CBP decides it wasn't a careless error but deliberate undervaluation, it's not just about back duties. Under 19 U.S.C. 1592, negligence penalties can reach twice the duties lost; fraud penalties can reach the value of the goods. How your case gets classified and what applies is strictly a question for your attorney and your broker — I'm putting the statute on the table so you understand the stakes, not giving legal advice.

Treat the Form 28 as what it is: CBP handing you a window to prove your case. Use it — submit complete evidence, and most cases close as filed. Miss it, and the Form 29 liquidates at the highest rate; in serious cases, a 1592 penalty investigation follows.

If you run an import warehouse, do three things this week

First, build the inbound photo SOP — full pallet, carton marking, open box, every receipt. Second, have your broker reconcile the SKU-to-entry-description mapping with you quarterly, not when CBP asks. Third, tell your broker to loop you in the moment a Form 28 lands — don't let it travel through the importer's inbox for two weeks while the clock runs.

A CBP Form 28 isn't scary. What's scary is a 30-day window with your evidence sitting in a forgotten folder on somebody's hard drive.

By Chen Feng, Warehouse Operations Manager