The Delrin inserts do not always look deformed, however they are very tough. Still, for $35.00 I guess it's peace of mind. I have seen more that spun that looked fine than ones that were chewed up.
It is doubtful that you did any damage at all other than ding the prop. And the insert is most likely fine as well, but cheap enough to keep a spare.
Glad you had a good trip and that you hit the rock on the last day, not the first