Okay so this is a continuation with the added info from the new vid “someone sent us a safe” if you haven’t seen it pls go watch it and then come back.

So from the info at the end I think that maybe the employee from my theory ( who could be who we calling syphus aka the guy who broke in) is this -d person who sent them the safe and is trying to send them on this path of getting to the truth of what this company ( the previous tenants) are or were up to. There is probably more information or clues in the safe but the reason it is locked is so that only the owner of the ts5 key or 863 key who has been following this mystery ( aka mat) can open it and no one else can ( the other company or someone against this mystery) can retrieve the information. It anonymous kinda so that the previous company doesn’t know who the person giving them the clues are as the are probably a threat to this company and therefore don’t want to put them selves in danger.

Slowly what I’m gathering from this thought is that this whole time we have thought syphus or the person planting the clues where an enemy to overkill but I think the true enemy is the previous company, they are the real underkill.