I think I'm on that list so you will have plenty of friends.
Guess one question might be whether you think you will ever want to go back to Peru.
We left our vehicle in Cusco (officially permitted by Aduana but the Immigration in Lima wouldn't have known that) and we had no problems at the international departures when our passports were stamped out. If we had abandoned the vehicle, then an outstanding TIP wouldn't have been an issue.
Obviously abandoning the vehicle or selling it to a local, while maybe not of any significance to yourself, could mean that eventually some countries get sick of it and start requiring carnets which would be a real blow, so hope you can sort out a legal way to do it.
Unless you can be absolutely certain that a particular procedure is 100% legal and approved by Aduana, if you go through the procedure and then go to aduana and ask them to cancel the TIP, you are giving them absolute proof that you have sold the vehicle to a local and then, if it were in fact illegal, I would think you DO stand a good chance of being denied boarding. Still, there is always the fact that Aduana aren't really involved when you fly out so even that may not matter.
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