Tips for Buying Broken Switch Consoles

Greetings, I’m new to Switch repair and electronics repair in general, although I do know how to solder. I was wondering what are some things to watch out for when buying broken Switch consoles. Are there any symptoms that could be indicative of a more serious problem? The first console I purchased only had an issue with the left joycon, but it turned out that the previous owner had botched a hardware mod lol.

A common thing to look for especially on auction sites it stripped or missing screws, a crack by the charging port and most importantly look at what else they sell and look at feedback, I found a few as “not tested” and they have clearly sold loads of switches so a false claim straight away