Some notes.
Hello. I went too. I got there about 6:30. Here's a link to some pics I took, I encourage anyone to grab them and take a look.
https://www.dropbox.com/sh/i7jfbsufwb60wq5/ZR1upRE3xI/pinball
I thought overall the condition was "ok". I would encourage anyone interested to take this with a grain of salt, I will be at the auction and might bid on any of them. These are some notes of things that would take away from their value.
Tron - Monitor didn't work and wasn't powered up. The fellow said it did work but there was a problem after it was on for a bit and they "smelled smoke and turned it off". Side art only on one side.
DK - The joystick could use a rebuild, it was hard to go up I thought. No side art.
Neo-Geo - Reset while I was playing it, not sure if I rocked it, maybe it has a loose connection? Monitor had some color separation in the bottom left corner and appeared to be slightly shifted to the left.
MK4 - Monitor issue where top of screen is "taller" than the bottom of the screen. In other words, two items of the same height in the game were different heights on the screen.
Pinball machine - Would power on, make some noise and some lights came on but you couldn't play at all. Every time you pressed the start, it would power off. The fellow said that it had worked previously when they brought it in. He thought the power supply might be weak. The score keeping area was completely offline and he said it wasn't working when they were playing it earlier.
Red Tent - Looks a little rougher than the pictures show I think, did not see keys and couldn't coin it up. Someone was playing duck hunt (they said they put in a quarter)

I didn't see the fourth joystick the gun took the place of.
Gridiron - Not powered on, not plugged in. Door was off machine but sitting to the side.
Bad Dudes - Could coin it up, but the darn 1up and 2up buttons wouldn't work. Could just need a cleaning but might need some TLC.
Swords - I had to coin it up and hit 2up a few times to get it work. I would say it needs a cleaning.
Lethal Enforcers - Screens colors were "faded". Player 1 gun worked well. Player 2 didn't seem to work as well.