Buying a used laser

I’m considering buying a used laser welder that was repossessed by a
bank from a jeweler who couldn’t make his payments. What issues
should I be considering?

It’s a Rofin 2002 80 joule model. It seems to be in good condition
and it seems to work just fine. Without too much trouble I can go
look at it and do whatever reasonable tests I want but I don’t really
know how to shop for such a thing. What do I need to learn to decide
what it’s worth? Are there any sleeper issues that are likely to bite
me in the backside by buying a used machine?