Hidden Vin #'s

Im guessing you found out the vins dont match? I would leave that can of worms alone. What happens when they want to know where the paper work is to the other car?
I have already done a title search on the other VIN. Last title was over 11 years ago. The state issued me a stack of paperwork including notarized Title certification. I am in the process of trying to figure out just how big the can of worms will be. I do want it to all be correct if possible.