One of two things is going on here. Either the new user didn't read the posting rules (or even look at some of the current ads for ideas) or somebody copied some pictures from The Outdoors Trader and is hoping to find a sucker who will send him money. I don't presume to know which it might be.
The user name in the photo gives assurance that at least the poster was at some time in possession of the item. Reddit.com has a further requiremet: the paper must be crumpled, which makes it harder to Photoshop.
An unfortunate person once paid $600 for a revolver I had sold through gunauction. Somebody had taken my pictures from the auction and posted an ad on a different trading site, claiming to own the revolver.