I was under the impression that since it's illegal to knowingly send counterfeit goods through the postal service[1] they can't accept returns of counterfeit goods.[2]

[1] I don't know about FedEx or UPS but probably against their TOS.

[2] This is also eBay's policy as well - http://pages.ebay.com/help/policies/money-back-guarantee.htm...

>If a buyer suspects that an item is counterfeit, and there are strong indicators that the item is counterfeit, we don't require the buyer to return the item to the seller. The buyer agrees to cooperate with us to ensure the proper disposal of the item. In such instances, we refund the buyer for the full cost of the item and original shipping, and the seller reimburses us for the refund. The buyer may not sell the item on eBay or elsewhere.