Possibly, but I believe we've already found all the obvious cases. As for others, I don't know. I do know how many rings are in each level (I should since I hold all but 4 ring records), so if something looked suspicious I probably would have reported it a while ago.
EDIT: I should also note that if you dig up rings, you can still go and finish RAing the level, but you'll need to subtract the number of rings you dug up from what is shown on the level clear screen.