As far as I know they are direct from titleist so not lake balls/refinished etc.
I think they may be used at tournaments for pros to hit on the range a few times then they box them up and re-sell. They have practice stamped on them but are still allowable for comps etc.
Basically imagine getting a fresh PROV1 out and then play 2-3 holes, these balls will be like that.
I think they are a bargain at just over £1 a ball.