Not sure of all the details, but have heard of actual garages/mechanics doing this… maybe if you find the owner somehow (vin search?) and perform some work on the vehicle or bill them for storage you could eventually own it if they don’t agree/pay your invoices. You would definitely have some paperwork/time invested, but could be a legal way out? https://www.levelset.com/blog/how-to-file-mechanics-lien-new-hampshire/