While the cards/set isn't a mystery, locating a complete checklist for the base and insert sets is. Can one of the members who knows some Japanese assist (DaClyde, maybe)?
Here's some info I've been able to locate, but much is either incomplete or in Japanese characters:
Sumo portion: https://sumocards.blogspot.com/2016/12/2016-bbm-masterpiece-sumo-checklist.html
Soccer portion: https://cartophilic-info-exch.blogspot.com/2017/10/bbm-japan-2016-masterpiece.html
Both auto checklists w/SN info: https://www.sportsclick.jp/user_data/signlist/2016masterpiece_list.pdf
Site I stumbled onto what appears to be the auto checklists above: https://www.sportsclick.jp/products/detail.php?product_id=8179#top
The set has a lot of baseball, including some early Ohtani, to hopefully tempt someone into assisting