Look I'm sure there have been instances of this happening but if a vendor was to try to pull that type of scam more than once it would come to the attention of the admins as others started to complain of the same issue. Tracking is the only tool vendors have to protect them from scammers too remember so if the tracking says it was delivered then as far as they are concerned that's normally an end to the matter. Take your time with vendor selection, just because of the shady behavior of a very small number of people do not assume this type of scam is endemic, the vast majority of vendors just want to vend with as few hassles as possible and unhappy buyers cause a LOT of hassles.