Is this kind of what it looked like before you or the locksmith took it apart?

What *do* you have as far as parts go? can you post a photo of all the plates and bolts?
Are you just missing 1 bolt or are you missing the main bolt, and the 2 relocker bolts, and the plate that held everything on to the back cover of the lock?
You're not gonna find those parts easily or at all, it is highly unlikely. Start making stuff out of sheet metal or have a machine shop make you some bolts or the bolts and the plate for you, or use the safe without relockers.
Do you want the relockers all intact and functional to use the safe to store cash or jewels or to restore it and sell it as a vintage safe?
The lesson here is that not all locksmiths as also competent safe and vault technicians, and that working on something on the work bench and then bringing the part back to the main safe body may have side effects. I'm guessing paying the locksmith to come to you and work on the safe there so he can see the issue you are having is not reasonable either money wise.
Squelchtone