BEWARE the terms: fully cured / pre cured / etc. These mostly will tell you what the person storing the rock did to it. What matters to you is, what dod the person you buy the rock from do to it. Becuase any rock that gets shipped to you any distance, in water or out of water, is going to need to be cured by you. Unless you go to the tub of rock in person, and drive it 10 minutes to your home, in tank water, it will need cured.
The difference in rock product that is transshipped basically comes down to how much stuff did the collector scrape off / flush off the rock before boxing it. The more they removed, the better it ships, and the smaller the ammonia spike and curing process for you.
S !