It makes no sense that CB would cover his tracks and then keep such a damning piece of evidence as a photo or video.
I share the view that if a video or photo was found in CB’s amongst CB’s possessions at the box factory and it shows MM being abused or deceased, then in combination with the other evidence we know about, a case to find him guilty could be made.
I am more inclined to believe that HCW has the info we know about, a positive ID from one of the witnesses on 3 May and various web chats confirming facts about the night including MO traits that match his other known offences.
The lack of a smoking gun like a photo is likely why we haven’t seen a charge IMO.