It’s easy to tell which of the named map collections are implemented with the help of the Enhanced Collection add-on and ticking the “incomplete” checkmark.
And a tip for finding collections:
Enabling your video card’s anti-aliasing (a normal practice for most games) is sort of buggy with this game in particular and results in props, characters and objects overlapping other game textures. This means that while the game will look a little wrong, collection chests will stand out very noticeably on sight by overlapping any texture that might have kept it hidden.