i had a similar experience when i sold one of my many many guitars a coupple years ago (it was then i realized that having the opportunity to buy a Porsche in decent shape for a good price >>>> having 14 guitars). anyway, the guitar in question had a small nick on it, and was touched up before it left the Fender factory. they did a good job of it and the only way to see it was if you held the guitar in a certian light at a certain angle, and it appeared to be a small dull spot about the size od a pencil erasser. it was on the top corner of the body, right where your arm rests when you are playing it (i really didnt care, and used it as a bargaining tool when i bought the guitar new because little stuff like that on MOST of my guitars doesnt bother me one bit). i put up pictures of it and used an eiting program to circle the area because no matter how many i took, i could not get it to show up on a picture. so the guy knew about it, and after he got it, he bitched me out about it for like a month and finally i was like ‘ok, if you’re really that bent out of shape over it, send the guitar back and i’ll give you your money back.’ he then says ‘uhhh, well i already insert list of modifications he already made to the guitar here so i couldnt really do that.’ i wanted to bad to be like ‘then shut the fuck up u peice of shit!’ but basically i told him i described it to the best of my ability and tried as hard as i could to get it to show up on a picture, but couldnt, so but agreeing to buy it, you agreed to accept the fact that you were buying this without actually being able to see the imperfection in it. if you wanted a perfect guitar, you should have bought a new one.
and for those of you who know anything about guitars, it was a Fender Telecaster made in Mexico (i had originally bought it to use a base for a project, but never got around to it) so its not like it was anything special or rare that a small blemish like that would decrease the value.
but serriously, i would offer to buy them back from the guy. be like ‘you know what? i’m sorry that you are not happy with them, and you are making that very apparent. so why dont you jsut send them back to me and i will refund you your money.’ i gaurnetee you he will say ‘well i already put them on my car and blah blah blah’ and then he has no controll power anymore.