Modsquirtle

It's been a few years and I recently rediscovered my copy of Astro-Grover for the Atari 5200. I have no idea if it retained any value or whatnot over the years but its never even been removed from the bag It was bought at auction in! Its the first copy of 50 stated on the back. Anyone interested or know any info on the piece? (Took it out of the bag it was in for a photo, it wasn't sealed or anything.)