They just want to be paid, the hammer is the legal repercussions. If they send you a bill, which they may, since there is no longer any exemption for goods under $800. The tariff on batteries, which is part of the shipment is 135% at the moment, plus a 50% and a 15%, so it comes nearly 200% of actual value on a drone from China. If you look at the commodity and tariff page with customs, there are what are called stacked and stand alone tariffs. Super confusing.
BTW, my half brother, from the side of the family I had superficial relations with, a lot older. Went to prison in Chino for receipt of stolen goods. Items he had no real idea were stolen. Not like he was a blue chip citizen, it is just what they eventually nailed him on, right up there with illegally copied DVD's. Gosh wouldn't that be embarrassing; "What are you in for?" "Copying DVD's." They all moved away from you in the mess hall.
Japan and Korea are both at 15% with extra stacked tariffs on things like batteries. Others are exempt, like auto parts. Kind of why I let others do the importing and I pay a tad more. Though on the Mavic 4 Pro Creator edition, I got from a US based supplier, turned out to be cheaper than an import. Like I mentioned, I have been nicked by customs before, months later.