I got a nightmare buyer at Discogs. And he returned again 8 months later under a new screen name. It starts often with a request for additional packing materials. They never ask about what you use to ship, just start making requests that are borderline demands. Then you look at their feedback see all the red Negs. This one I googled him and found info in other forums calling him a seller's horror story. And they mentioned he was kicked off of ebay. He was called a total lunitic. I won't go into it exactly. But every 6 or 7 years you get one of these. You know it's pretty bad when their reputation is all over the internet. And the feedback has previous sellers outraged, stating his threats and demands were reported. All you can do is laugh really, and try not to let it get to you.