I think you are making a bigger deal of it than it really is as there are definitely people on here that have experience with Pinbox and Nucore that can help or worse case you can buy the original parts and restore it to factory.

The one thing I would ask is what shape the game itself is in and what they are asking for it? Is the original monitor still in it, how does the playfield and cabinet look, etc? Depending on that should be the real determining factor on whether or not you buy it.