I think that the odds they would have blue Australorp or blue orpingtons is pretty slim.
I'm guessing what you have there is Asian Blue chickens.
My local tractor supply had blacks last week.
I don't know much about them I think they may be a new hybrid layer.
I will go do a little more research.
It's clear they're not barred or cuckoo anything as none of them have a head spot.
I would also guess that your little chipmunk looking chick is a brown leghorn as these type of stores usually get layer heavy shipments. Yes sometimes they get fancier breeds like speckled Sussex. If the chick has yellow legs it's pretty likely to be a leghorn but many breeds look like that when chicks.