It's hard to tell by those photos whether it's just dirty with surface rust, or if it's pitted where it would need re-plating.
Has the seller stated if it works or not? I'm assuming no but some S plus fixes are quite easy! And it's a "nudge" machine which are much more fun than the regular 'ol Double Diamond.
I'd pay $200 for it, provided the machine just needs minor repairs and a good cleaning. Some parts though, like the MPU are getting more expensive to replace. I'd seen them on eBay for $30 but now the prices have gone up. We still have members here though that would give sell one at a fair price. 

Try that last reply first!

If the problem still exists, inspect the connection from the BV to the power supply. Power off, disconnect the plug to the BV's power supply which will be mounted against the cash can housing. Inspect that plug, Also check the two small plugs connected directly into the BV on the left. Sometimes those small wires break but still appear to be connected.

Looks like a license dongle not a game loader usb drive

So, perusing EBay today and noticed a listing for a flash drive that supposedly has an IGT AVP game of Addams Family. The listing gives a # GEII 000187 “Adams Family“. Has anyone seen this game? I did a Google search and all I get is the 3902 variations. The listing is below and the pic of the flash drive is shitty and is hand written.

https://www.ebay.com/itm/116147644277

Dan (Tacman)

Hi everyone,
I'm struggling with this Multi-Denom issue.  I've cleared and keyed it 3 times with no success.  I've followed the steps I found on NLG.  Basically, it works but doesn't.  I setup all 4 player Denom, game denoms, all good there.  After the initial setup, it defaults to the 1-position for Denom, which is great.  After that, if I press any of the othe denom areas, it makes the loud "CLICK" sound and moves the denom to position 2.  Then it won't change to another denom position, even with the "click" sound being made, it's stuck on position two.  It never moves to any other position nor back to position one ever again, unless I clear/key it.   Even just a "KEY" does not put it back to position 1.  I've swapped out 3 different "known good" multi-denom touch panels (they work in my other machine) so I know it's not those.  It makes a sound every time you press one of the other areas but won't change.  This problem carries between MPU boards as I've swapped 3 thru the machine with different game base-chips and the problem stays. I've also swapped my i/o boards with known good ones, no change.  The only thing I have not swapped is the backplane/motherboard - could that be the issue?