But the question may have been from something other than a "legal" perspective...
The rock will certainly work in your tank... but if it goes in "as-is" you will likely bring in a lot of unknown "critters" and such to your tank. Some may be good, others bad.
If you plan on just bagging it and transporting it any significant distance (like a multi-day trip)... it's gonna stink when you get home, it's gonna be full of dead and dying algae and bacteria, and you'll probably want to boil and clean it before you used it in a tank... due to the time and effort involved in that, it'd probably be much easier just to have BRS deliver "new" dry rock to your doorstep.
...(and then seed the system, if you desire, with one or two pieces of cultured LR
from your LFS