Thank you for your input, guys.
It was listed on a classified site, like ebay (olx) but without feedback ratings.
As for the guitar: I once realized that one of the posts wasn't perfectly vertical. Made nothing of it as the guitar felt solid, and tuning and intonation were always right. The guitar was at a luthier for checking out, making the pickguard and installing the BKP, and he didn't warn me of anything. It always worked perfectly for me.
As for the buyer, he replied to the e-mail late this last night, saying that he toke it to a luthier who quoted him 30 euros to "reinforce the area".
I transfered him 30 euros today, adding to my loss. I did it, not because I felt I was at fault, but because I want this deal behind me as soon as possible, as to not think about it anymore. I regret selling the guitar, but did and now want to forget about it. Not the best way to deal with it, I know, but now it's done.
Since I offered to go get the guitar back and the buyer didn't go for it, I:
a) know that the guitar isn't all that bad after all...
b) won't be answering any further contacts from the buyer. :shock:
c) I don't think I will be selling another guitar.
Time to move on, and ansiously wait for my new BKP Abraxas.