I don't know the name of this shrimp but where I live they are called opae. Not to be mistaken with opae ula. But I do believe they might be the same
Opae, as you probably know, is just the general Hawaiian word for shrimp. The animals in your pictures would be the Neocaridina denticulata
(might now be N. heteropoda
, depending on who you consult) that were introduced to Hawaii from East Asia. Same species as cherry shrimp.
I'm not that great with Asian atyids, but I don't think these are what OP has (body form reminds me more of a Caridina
from the "bee shrimp" group).
At any rate, it's not uncommon for these non-target "contaminant" species to show up in shipments of Amanos, since they're all wild-collected.