My further response:
Merchandise sent to you in the mail that you did not order is yours to keep. This includes any extra merchandise sent with items you did order. You do not have to send it back, and you can't be made to pay for it. Under the law, this is considered a gift. Enjoy it.
If a private delivery service, such as United Parcel Service, brings you merchandise that you didn't order, you must do two things before you can legally keep the merchandise:
1. You must alert the sender (preferably in writing) that you received goods that you didn't order.
2. You must allow the sender a reasonable amount of time to pick the merchandise up at the sender's expense. You should tell the sender what you intend to do with the merchandise if he or she fails to pick it up.
If, after 30 days, the vendor fails to pick up the merchandise, then that would be considered a reasonable amount of time, and the item is yours to keep.
IAAL