I guess I am more wondering what type of purchase feedback I should leave
+1 - I've had this happen with the 600 NWT polos I had in stock. I did my best to inventory them when I got them, and set everything up, but somehow one gets lost here and there or you cant find it. I'm a small time seller, but when you get larger stores you are going to print the labels before you pack up the item hence you getting a tracking number before it really shipped. Ask for free shipping or something off, but either way, if IMO no harm was done and it was an honest mistake leave no feedback at all if you don't feel right leaving positive feedback. It's another thing if you see it listed a week later at a much higher price, although it sounds like he was doing a BIN so it was not an issue of the item selling less then he was happy to get for it, just an honest mistake.
This is more along the lines of what i was asking. I do not feel right leaving positive feedback but I know how damaging negative feedback can be and I don't think it warrants negative feedback. Is neutral feedback negative by association?