Reputation spent on a bounty is lost immediately upon placing the bounty, and there is no way to get it back. Either it gets awarded to someone (who isn't you), or it disappears entirely.
Quoting from the FAQ:
In any case, you will always give up the amount of reputation
specified in the bounty, so if you start a bounty, be sure to follow
up and award your bounty to the best answer!
Think of placing a bounty as paying an advertising fee with your reputation to draw attention to your question. Whether or not it was able to get a good answer, the advertising occurred.
For more information about bounties, this post is pretty thorough.
Your particular question might not have received an answer simply because the real answer might be "No, there wasn't anything just like that in the previous games", and there's no one willing to take the time to prove that. Proving a negative generally requires a lot more effort than proving a positive. For someone to write a good answer that says "No", they'd pretty much have to list off every scene from the previous games just to prove they don't match.