OK, I've been surfing the "net" and looking at a zillion photos of 2014 Jayco, Jayflights. Not knowing the model number, I can only speculate, but I did hit upon a couple photos that might have been a near miss? Maybe???
How about one of two thing? First thought.... the glass that fits in front of an electric fire place. But the size is a bit small.
So I kept looking, and ... not knowing the holes are positioned, chances are they are about 3.5 to 4 inches apart, for a handle to be screwed into. On the opposite side, there would be attached hinges that secure to glass panes. In that case, this would be a glass door to a cabinet.
If your camper does not have an electric fire place, or glass cabinet doors, then it's possible it was left there, intending to go into another camper on the assembly line that did have a glass door in one of the cabinets.
There again, without a better description of the glass, or a photo, we're all still guessing. But my guess in a cabinet door intended for a different camper.
