Live sand and all live rock. Meaning really cycled rock.
At the lfs
they dump in new rock on top of the older rock in the live rock tubs. If you can find honest people there they would tell you. The rock you get which is at the bottom might be more BB filled.
As in a discussion I had in one store the person there discussed it with me about the rocks to the back would be the ones which were there the longest, and how they basically drop in the dry not cycled rock into the tubs so they can begin cycling them and building BB. Like drop them in Monday and sell them on the weekend. Those rocks wouldn't be actually filled with BB.
A week is crazy fast. Trying to add fish or inverts before the tank is really cycled usually means dead livestock.
What size tank?
What livestock, and why the big hurry?