So, I'm a sick, sick man.
I order spare parts from Nintendo. Any time I need something (like, say, 20 DS cases), I browse through their store and see what else they have. I order stuff I don't need. I still have an original DS wrist strap in the "Official Nintendo Replacement Part" pouch.

Anywhoo... during one of my spending sprees, I saw they had some kind of screen cover for the GBA. I wish I had more info on this, but it was soooo long ago (and now, you can't see your order history on Nintendo's website. Boo!).
Anyway, I got it and it was weird.... nothing I'd ever seen before. In fact, I actually broke mine (sad face) and tried to order another one (no luck) then tried to find one to buy - anywhere - no luck. I've ever seen one again... until today.
I set up a local buy/sell/trade page on Facebook (if you like old video game junk, do this - I got a Game Cube in great condition for $10 and an okay copy of Luigi's Mansion and a minty copy of the OoT/MQ GCN disc (along with a disc-less copy of Metroid Prime, which was great as my copy did not have any of the manual stuffing with it) for $30.)
Well, today, I picked up a spiffy black Game Boy Pocket (with Power indicator), a green Game Boy Color, an Indigo Game Boy Advance, 4 games (Tamagotchi, Mario Land 2, Donkey Kong Land 2 and Kirby Tilt n' Tumble) for $50 (also, some crappy case and a worm light. meh). Because I needed more Game Boys.
Well, you can guess where this is probably going... the GBA had one of these screen covers on it. I sent the previous owner a message to see where they got their's... I suppose they could have ordered it from Nintendo, but it seems unlikely.
Here's some pics, as I'm sure you're curious as to what it looks like...




As you can see, it has the GBA logo on it, which makes me think it's an official Nintendo product (combined with the fact that I ordered mine from Nintendo, of course) - but what's odd is that there's no hardware number on it (you know, NES-001 or such).
Anyone have any info on something like this?