I would send them a photo of the IMPROPERLY MARKED AND SHIPPED box (no haz-mat markings) and ask them if they REALLY want me to file a claim with FedEx and show them that the seller isn't following the DOT shipping regs OR the FedEx shipping rules for shipping hazardous materials.I just had a bad experience with that seller.
Primers were shipped in a really flimsy box, no ORMD label, and just some paper to cushion things. The box arrived torn, missing some contents, and leaking primers!
Calling the company it turns out they wash their hands once it gets handed to Fedex, so *I* have to try to get FEDEX to refund/replace the shipment.
If their answer is to go ahead and do that, then they are idiots just asking for some real trouble.