If your car is in repossession and the repo man never finds it will the bank or dealership eventually report it stolen?

Why would they report it stolen?? IF it was stolen from you, then YOU would report it stolen. The lender loaned MONEY so they will recover money(garnishment, leins, ect.) if the collateral disappears.

They will eventually find where you are working and you will pay for not only the car but court fees. Do yourself a favor and give the car up it's not yours.