I didn't, either. And I don't think the OP has been resolved yet.....so let's move this into a slightly different situation.
You're visiting a friend. They have a nice Harley-Davidson in their garage, a model you've been looking for. You ask if they're interested in selling, and they say no, they're just storing it for another friend. Trouble is, the friend has left it there for a year, hasn't called, and your friend hasn't been able to raise them at all to try to get them to pick up their motorcycle. A keg is a vessel for transporting liquids, a motorcycle is the actual product (don't say it's a vessel for transporting fuel...).
I'm sure you've figured out the denouement (we have to ignore the part about the title, by the way....we'll assume the title was signed over to them for some reason, so that the legal part is clear, but the original owner made it clear that he was coming back for it at some point). Your friend offers to sell you the motorcycle for what he regards as a year's storage fee, $500. Ignoring everything else, including the market value of the motorcycle, are you ethically compromised by buying it?