What should we do with floor tiles that were applied with Type 1 Mapei mastic?
What's done is done. I'd grout and generally move on with life, and only revisit it if and when the tiles start popping on their own, which may never happen. 

You are NOT a professional tile installer who would be well advised to rip out and do it over for the sake of their reputation. So you don't need to act like one.