I wouldn't worry too much about it in the short run, I just got that package and I got one decent sized peppermint shrimp and the rest looked like ghost shrimp. I am pretty sure they got eaten by my one of my fish when I put them in there.
One of my large cleaner shrimp that I already had was chasing my new CB around all over the place (I think he was going to eat him) and eventually ran it into my bubble coral which then commenced to eatinng the CB shrimp.
If you have an established tank, with larger shrimp and fish in it I personally wouldn;t get the package if you reallly want the shrimp b.c there is a good chance they will be killed.
I just wanted the crabs (hermit, emerald) and the snails, so priced individually, I got the shrimp for free.
just my $.02