What sized tank and how many lbs of rock in there now? I'm thinking 2-3 lbs, of what you described as "really" live rock won't be a problem. But, just in case that stuff on the LFS
rock is dead, I'd suggest 2 things. Give the rock the sniff test. Should smell like fresh beach water. Then watch the ammonia for the first couple of days to make sure there won't be any problems.
really got live rock with shrooms
and stuff on it? Wow! Like mentioned above, make sure they're not dead sponge.