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Needless to say...whatever at the rudder, may have also caused keel damage, so do ask your surveyor to poke around. In depth, no pun intended.
If it was impact damage, that tends to travel in odd ways in a boat. I've seen bulkhead tabbing break and shelves shift all over a 29' boat that was "lightly" t-boned in race. It is possible that the drive shaft, prop support, engine mounts, engine main bearings, all took impact damage. Most likely not--but still, you can get surprises. On a boat in that size range, it pays to ask the seller exactly what happened. They may very well have gotten a survey and decided to get rid of the boat instead of repairing it, because of things that are not readily seen.