Okay you will all laugh but I have to chime in on this.
I'm pretty sure the Paragon you bought with that bad backglass was my previous one, the chap I sold it to (again not naming names) was adamant that he was going to replace mine as there was some damage. I have also heard on the grapevine that the buyer when he sold it on was somebody on this forum.
The backglass that was on the original game, and this is what makes me laugh, I'm pretty sure is the exact replacement backglass you have got and put back in it, it had exactly the same missing bit out the bottom right corner where it says "1 to 4 can play".
So as far as I can tell, I sold it, the backglass was replaced with that printed monstrosity, and now you have got the backglass that was originally in the game anyway and put it back in!
Incredible!