“Marks on the underside”


I sold a piece of equipment on eBay and described it as having only slight almost invisible blemishes.
The buyer requested to return it to me because of “marks on the underside.”
I granted the return without delay.
Now I’m having second thoughts.  My question is, do marks on the underside which obviously are not visible when in normal use, count as a valid reason for return?

rvpiano
Post removed 
I would never complain about marks on the underside.  That's a BS move by the seller.   The seller should be embarrassed for even bringing it up, let alone requesting a return.
"Perspicacity"?     That buyer seems much more shrewlike, than shrewd!                                                                               ".....not worth the hassle."    +1
Picky picky picky.    Since when is a buyer a seller? 
Sounds like the buyer changed his mind and grasped at straws.
Who is to say the inconsequential marks weren't created during unboxing?
Sympathies to you, rv.

Ebay has many turkeys you got one.I would never deal with anything on ebay.