Sly 2 Map Mastery Mod - My Unfound Easter Egg

This is an easter egg that I hid in the now-shelved Sly 2 Map Mastery mod. I hinted at it in Update 2's release video, but to this day, no one has ever reported finding it, so I'll go ahead and show it off, since I doubt anyone would've ever found it. I am working on bigger and better mods, don't you worry.