Birds reclaim stolen bike shocker. Pls Advise

Unknowingly being unlawful is still illegal! That's my point. The girl can cry as much as she wants but that doesn't change the fact that she wasn't interested in where the bike came from in the first place. I know it's Gumtree but what would you say if someone steals your TV from you, then you happen to go to a party where you discover your own TV. Thief gives it back to you but you insist on giving him your older TV he left which was in your bedroom... Come on...

Sorry if that doesn't make sense. Bit tired.

How do you know she wasn't interested. Perhaps the guy was very convincing with a backstory of where it came from and why he was selling it. Perhaps she asked but didn't know enough to ask the right questions. And I'm not suggesting giving anything at all, I'm suggesting selling her something out of stuff that is already for sale.

Parts get sold, forumengers get money, girl keeps riding a bike, win all round. I can't see a problem with it.