I think some people are confused,
What is in the tank is baserock, looks like Tuffa, The stuff in the rubbermaid is LR, and it looks fine, there will be plenty of coralline that will grow out of the LR that you have.
I maintain about 7 tanks on the side. I think your guys is a little too cautious, but usually you find it the other way around.
LR does not need a light to be live, the "live" part of LR is the bacteria and the amphipods and copepods and they don't need light to live. People mistakenly think coralline is an indication of good LR when it is actually an indication of good balance of alk, pH, and Ca, in fact coralline incrusted rock probably hinders some of the biological capabilities of good LR because it covers up the nice porus rock. Coralline is just a bonus, it has no real value in a tank other than asthetics and in fact becomes a nuisance in most tanks.
All the color will come back on that rock, and as long as your ammonia levels in your LR storage bin are fine I see no reason why you cannot put it in the tank.