While I know not each and every one had to do with the story or was indeed in anyway compatible with the actual pieces, can someone provide me with a full list of canisters that did either of these things? So far, I think it goes something like...
Toa Mata - Story: What they famously washed ashore in. Compatibility: Technic pin holes and head piece.
Bohrok/Bohrok Kal - Story: Resting chamber.
Toa Nuva - Compatibility: Same as Toa Mata, but with two more pin holes in place of the head piece.
Rahkshi - Compatibility: Resting place for the Kraata?
Kraata Collectibles - Compatibility: Resting place holes for the Kraata and Technic round peg hole.
Toa Metru - Story: Two lids could make a Matoran Sphere, as seen in the story a few times. Compatibility: A disc could be placed on top of the lid side and in the middle exists a Technic round peg hole.
Toa Mahri - Compatibility: Technic round peg hole connections (and more?) exist on top of the plastic part of the box.
Thanks in advance if you can help me out!