[mothered]

Lets say they accept the return and issue me the refund, can they blame me later on?

No, the buyer who purchased your return can be held responsible.

Who's to say he Isn't an SE'er trying to claim a refund by saying an Incorrect Item was In the box?

for example when another customer buys it, can i respond with '' You issued me the refund means you checked the product before you issue the refund? so you cant blame me?

Don't elaborate on It.

Simply say you have no Idea what they're talking about, and leave It at that.