hmm..most probably its hiding
after the shrimp motled..it will go into hiding
wait for a couple of day more and try to spot it
the purpose of leaving the moult very visible to you (and other fishes)
is to use it as a diversion, as it hides and wait for its new "shell" to strengthen
as to avoid attack from other fishes
got this info from a fellow reefer..so i may not be 100% accurately correct
but..
like what reefer usually say
Just My $0.o2