25 yrs in hk, so the guy is not a kid and is experienced in photography having dealt with this shop for years.
He is "conned" into buying what sounds like a very expensive piece of kit. He had no idea of the price before he buys, yet an hour later he seems to have done the research he should have done before buying, and finds it's cheaper elsewhere.
For this really expensive lens he does not ask for a receipt? How likely is that?
Also without a receipt there is no way he can prove to anyone, let alone this board, that he is really telling the truth.
To me this story, and first time post, does not add up.
We are not being tough here as joy suggests, just a little cynical maybe, and logical.