What are you CSI?
The poor guy got beat here. I don't know what his recourse is going to be.
No but when you go to purchase a bike especially from a private seller you really have to know what your looking at and what to look for. He admits he noticed the rims being mismatched on both the sellers bike and his friends, I would have instantly asked the seller right there why he swapped rims with his friend.
Also, he didnt get "beat" that awful badly, his problem is reverseable and probably resolvable with the seller.