Yes, the later ones were sealed with grey gasket eliminator. No gasket.
It may have been apart, but it's also possible that the missing snap ring broke, and things got to moving around. As long as the machine was run with the broken mounts, that eventually snapped the axle tube to pieces, it's no surprise that things inside may also have been broken and neglected. Probably good reason the thing was "junked".
Either way, what are you going to do now? Use the ring and pinion that was in the other case, along with the other case?
No matter what, I'd check the contact of the ring and pinion when you go back together. People like to think, "It's just a lawn mower, who cares. Stick it in a go." But, it can wear out prematurely, or even be too tight and cause issues. It needs to be checked. Go through the service manual on the set up of the rear end. It's good practice if nothing else.
That looks like the pinion was set too deep. May have been that way from the factory. Or, someone may have messed with it. Hard to say at this point.
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