Hi - thanks for posting this.
It is clear from your photos that this bottle has been heavily polished - this is a dug bottle with lots of wear and dings..
It is possible that someone applied a layer of spray lacquer over the surface of the glass. You may sense that the glass has something of a plastic-y feel to it that is different than when you handle other glass pieces. I might try gently rubbing a spot with a penny to see if it digs into the surface.
I also seem to recall that immersing the bottle in warm water (but not too warm!) can remove a lacquer coating but that might void your option of returning the piece.
Do let us know what you find out.