There are three tells to me that this is a scam by the seller.
1) he uses the term "we" when referring to himself. is it just me, or does every scumbag on these boards refer to themselves in this manner.
2) his name involves Jesus. Seems that anyone who names themselves in a religious manner is usually trying to do so to do people into thinking that they are a decent person. I know I know, it's probably more a reference to Kanye, but the principle still stands.
3) he refunded the money immediately without spending much time to look for the book. This being the only real serious point of my post, it's very telling. If I were in his shoes I would tear my house apart for days before I sent the money back. I would let the seller know that I was doing so. And ultimately if I was unable to find the book after an intensive search I would then, and only then, refund the money. on the other hand, if I was trying to Welch out of a sale, I would just refund the money and say I can't find the book.