It’s been a while since I don’t ship oversized items to FBA, but we just received a product that we purchased at a deeply discounted rate from the manufacturer and it is 30" on its longest side. Per Amazon’s requirements, “A box may exceed the 25.0 inches if it contains a single oversize unit that measures longer than 25 inches. If this is the case, then the box must only contain one single oversized item and must not be significantly longer than the item dimensions”
I’ve seen this before, but am still able to create a shipment with Send to Amazon with 6-unit cartons without problems. Not sure if a disaster is waiting to happen if I ship it like that. Advice from FBA sellers who’ve recently shipped oversized items would be appreciated.