You can try putting it in each gear and spinning the output flange. If it turns smoothly through a number of rotations (ideally, a complete revolution of the gear set inside the trans) without Ugly Noises (TM) or binding or excess drag, it should be fine. If the car actually was at speed when the engine seized, the tires likely slid or the clutch slipped. I think the CV joints are weaker than the transmission internals, as well, so if anything downstream of the clutch broke it would have been those.
-soD
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