NHL gloves? Hardly. They are probably almost brand new.
NHL players change gloves as much as possible. They never even get close to be going through a beating. They are swapped for brand new ones long before.
But often players reject or change teams and don't get to use the gloves OR they could be leftovers that no one has used yet. Also, consider that a lot of "Pro Stock" gloves are just custom order gloves.