Customs may get the munchies ... OM NOM NOM NOMMMMM ...
They like to sell our goods for Tim Hortons.
On a serious note, just give it time ...don't call them either cause than they'll just take even longer to release your shipment just to spite you.
Some people have gotten unlucky where the agents have gone to the extent of disassembling magazines/parts than do a shitastic job re-assembling it.
It could be as simple as putting a scope back on a rifle but they'll 'forget'