It will have a second skin so to speak. It'll be a protective plastic film. You know when you buy glasses they have a sticker on the lens that peels of. It's always there telling you the UV protection rating of the lenses, or always is in the UK anyway.
Well it'll be like that but a bit tougher to pull of as it's made to stay there until intentionally removed. You'll need to peel it off and as long as that's intact, with no dinks, scratch marks or what looks like it's been pushed back on it's self it'll be all good. It's applied after the sheets are manufactured so they can slid on each other without any damage being done.
Even if it's been removed it's not a worry. It'll just make it that slight bit harder to see small scratches. I have seen a topic on here a few years back where someone got some rather nasty scratches out of an acrylic tank. It can be done but it requires patients is all