MK Supplements never ordered, billed my AMEX $89, I filed a dispute, they sent a suspicious-looking package Internet

In early May 2009, my AMEX was charged $89 from MK Supplements. I ordered nothing from this company. The charge appeared about a week after AMEX sent me a new card, explaining that my account had been compromised. I disputd the charge and it was removed from my statement. Then, a few weeks later, I received a suspicious-looking package from MK Supplements that clearly had two bottles of pills inside. The envelope was thin and covered with stamps and the return address was a PO Box. I did not open it, but sent it back, return to sender.

Amex tells me they are treating this as a "return" and not a fraud because I did receive a product and return it. Also, they said the dollar amount was too small to be investigated by their fraud unit.

Kmontgomery
Richmond, Virginia
U.S.A.