Dropping an R22 may increase the bend in the beam that VFR mentions - however it is bent to some extent as it comes out the factory, so don't reject an R22 just because it is bent.
If I remember right, RHC specify a check of the height of the tail stinger above level ground as part of the check after a heavy landing - it will all be in the maintenance manual. Presumably it effectively checks that any deformation of the skids was elastic and that the skids system remains within limits.
I guess what I was trying to say earlier is that, in my experience you are more likely to get damage from drops, in practice, away from the skids.