Bottom line is these machines are "toys" not life & death. Ever call a doctor about something serious or go to an ER at a hospital. Hell you can sit there and bleed to death before anyone will do anything for you.
I know as the buyer this type thing sucks and it is also tough for the seller but give everyone some time. It is the weekend - it is less than 2 weeks before Christmas - some people have a life other than pinball.
As far as checking over a machine & then it having problems. I can tell you with all the stuff going on in one of these machines not having problems is more rare than having problems. Solid State machines are easier than EM's for the most part but just banging one around a little moving it can cause a bunch of problems let alone the fact we are talking about a 1/2 mile of wire, hundreds of possible things that can go wrong, etc.
So step back - take a deep breath - and give it a day or two before talking bad about a tech who my or my not be at fault here.
Just my 2 cents!