Is there a way to refuse a USPS shipment?

[rgG]

Now that I know I can refuse it, does anyone see any reason that I shouldn't send it back this way? I won't have a way to track it and prove that I returned it and I do want to get my money back for this item.

They did say I could refuse it as a method of canceling the order, but what if they say they never get the return. This is why I try never to return things, so many ways it can get screwed up.