Did the buyer indicate as to whether the package looked like it had been opened then retaped? Any damage to the packaging? Has he sent you any pictures of what the packaging looked like when it was delivered?

Like someone else has already mentioned, the blower itself is probably the heaviest item in the box and would definitely be able to tell if something was missing unless the UPS driver was just negligent and wasn't paying attention. That's always a slim possibility as well. I just don't get why only the blower would be missing, especially if the box was not damaged.

That's a tough call to make man. You mentioned that the buyer is on this board so he's relatively close? Why didn't he just meet up with you instead of having it shipped? That's what I would have done if it were me.