Q. Am I obligated to return or pay for merchandise I never ordered?
A. No. If you receive merchandise that you didn’t order, you have a legal right to keep it as a free gift.
There's a reason why, when buyers file an "item not as described" dispute with Paypal or their CC company, they win. Because that's the law. You can't be forced to pay for something you didn't order, nor can you be forced to go through the trouble of returning something you didn't order, even if that trouble amounts to no more than stuffing it back in a pre-paid box and leaving it on your doorstep for a pickup.
Then by all means, you should order that wallet and dispute with your CC.
See how well that works out for you