Tough call! If it was in an established tank, no reason to "Cure" it. However, whenever you move rock around, surfaces that were exposed to light are now covered, and vice versa. Meaning, you will get some die-off -> ammonia -> etc.

I would suggest rinsing it well in your water change water and placing it in your tank. But, be ready to watch nitrogen levels and do 25% water changes as needed for 4-6 weeks. It should settle in quickly.

One note: In case it was out of their tank, say in a cold garage, for a week or more ... then you may need to "Cure" it awhile in a tub, same temp as tank, with a skimmer if possible.