A few years ago, I picked up a non-working Bally/Summit dollar machine. No keys. Seller assured me there was at least $100 in coins inside, but I was skeptical, so I offered $150 for it. When I got it home, drilled the lock, and there were 155 IKE dollars in it. Eventually I got all the bugs worked out and got it working perfectly. Best slot deal I ever found:

Slowly building a knowledge base on E2000 series Bally machines and J400 Jennings. Started with the antique Mills and Jennings. Getting there...