99% of LR is drop shipped. everyone gets it from the same places. chances are, swf doesn't even see it before you get it. it's just the luck of the draw if you get pieces you need to break, or that are too small.
as for life on the rock- usually, most of the visible life dies off anyway through the cycle and you wind up with a whole new group of life on it after the cycle.
most people are mis-conceived about live rock. it's the bacteria and surface area you are buying, not hitch hikers and algae. those are just bonuses, or negatives.