That’s a terrible idea on how to sell vinyl. I sold all my vinyl and everything analog a couple years ago. It was very easy. I went out and looked on a couple websites for the range of prices people were asking for each piece. Then, I would only sell in lots of 10 or more. I initially asked for a decent price for all of them, but selling them in bundles, I made over $1000 more than as a whole. Nobody asked for a refund or credit.
But if he is running a charity deal, then just giving them to some local young hipsters would be cheaper than scammers asking for refunds on everything including shipping.
or selling them to a local store that peddles LPs.