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No keys for them either. I really hate to drill 'em

probably because an operator switched them at some point in time.
common practice.
yale locks, which jennings used during this era, have the same screw / bolt pattern as the mills bell locks.
if you have any mills keys, play around with them before you drill.
you may get lucky... it does happen on occasion.

Thanks. That's what I thought might have happened. I'm going over and try all the spare mills keys I can find tomorrow. I have access to about a hundred of them.
The flat key locks on the vendor doors will be easy.

Well, I got lucky on the upper back door and found a mills key that fit. Lower cash door, not so lucky. So off to my lock smith today to see if he has a mills key that will work, or else it's drill time. At least he has a way of drilling a mills lock so that any mills key inserted will open the lock.

if you got the top door off, you don't need to worry.
unbolt the sub-base, and the bottom door will come off.
then you can re-key the mills lock which easy to do.

Thanks ill give it a try. Looks like the front bolts are below the base though.

Worked like a charm. Removed the two rear carriage bolts and two hold down screws and the base lifted just enough in the back to get the cash box door off. Made a new key in a snap. All is well now and another bell lock saved from drilling.
Thanks guys.

you're welcome.
glad to help.
that is what this forum is all about.