im not sure but usually you could smell during the grow too, just sometimes it will change as it dries etc.
maybe you just got a pheno of the RRF that smells very like C99. you can usually get a few types of the same strain from autos so theres the possibility of a fuel like one, a fruity like one etc. depending on the strains used to breed.
i grew rrf last time and all i got was a kinda fruity smell
just had a look at a strain review of c99
that would fit with what i remember from my rrf might just be that?