>>8415353BS01 has lot of prototypes and concept art, most of the known one at least
>https://biosector01.com/wiki/Gallery:Prototypes>https://biosector01.com/wiki/Gallery:Concept_ArtThey are however missing, for some reason, those super early Piraka/Inika prototypes that were posted here and on [toyspoiler]Twitter[/toyspoiler] a few months ago. Posting the Twitter link so you can see the first four, plus there should be Jaller hidden somewhere among the replies. A sixth white one has never been found however.
>https://twitter.com/Kingsidorak/status/1272228826135830529BS01 is also missing things like pic related, which is an even earlier Gali Mistika (aka blue Tahu), with blue torso and legs, from who-knows-where. The one you see on BS01 is identical to the final Tahu set sans the blue. I happened to find it by pure chance though. Who knows how much stuff there's still out there waiting to be discovered.