First things first...look at the rock. Look for good coraline growth and other signs of cured LR
such tube worms, smal corals, etc. Also, smell the tank water. If it smells like sea water with no foul odor it is most likely cured LR
. As mentioned, get a detailed Hx of the tank and LR
. Ask how old it is, how long the rock has been in the tank and if meds ever used in the tank. If all checks out $2/lb is a screaming good deal.