they most deffinitly could be eatting them... make sure you have some shells for them to move into.
I have seen my blue hermits try out shells that are way to big for them, only to go back to an already too small shell. You may be experiencing the same thing where the hermits think that the shell will work, only to find out that it doesn't.
75g w/ 30g sump, 160# LR
, 60# sand: Inverts =18 turbos, 30 nassirus's, 40 blue leg's, 5 emeralds, 1 CBS, 1 skunk cleaner, 1 brown gulf shrimp? and various other LR
hitch hikers yet un discovered or un-ID
Fish=1 yellow tang, 1 yellow headed jawfish, 1 pink/blue shrimpgoby, 2 perc clowns.
Future fish = 1 sixline, 1 lawnmower blenny