At that price, all of that is probably boat rock... nobody ships air-freighted rock via UPS, it goes to DIA freight (usually Southwest) to get back into water the same day that it was boxed.
None of this matters... it should still be phosphate free, full of diversity and ready to denitrify and filter the water once it is cured. This is the kind that I always buy since I see no need of paying 2-3x more for all of the surface stuff to die in the cycle.
I cannot find anybody with 300-500 lbs. There are only a few places in LA that have rock, so I would not be shocked if all of these places are out of stock. Please post if you get some confirmation that your order is inbound.
FWIW, and I will keep my soap-box short, this rock is significantly cheaper than using dry/dead rock and paying later on for all of the issues with it.