What to do about a stolen camper??

The for sale ad was probably fake news.

Those scam ads are a dime a dozen. They grab pictures sometimes descriptions from other ads (or in this case a stolen report) and post a for sale way under value. It's just the bait for a further scam. If in doubt, Google search using part of the description in the ad and you'll often find the source.

When I was shopping for an excavator there was one of those almost daily. I turned in or flagged a bunch.