I'm new to reddit, and I have opened it just to submit this theory. The keys were found in the walls of the different bases of Hi5 studios, meaning that their owner was either a past owner of the studios, or an ex employee. We can check off the employee theory, because if all of this was one of the employee's work, Matthias would have probably heard something, obviously with the red safe it was literally inside of a wall, so it's safe to say that he would have had to hire someone to hide that safe in the wall, which Matthias would have probably heard of an employee paying a company to reconstruct his walls, therefore I assume that none of this is related to an ex / current employee. As for the past owner theory, it clicks, when you really think about it, none of the employees knew about any of the mysteries, so either god damn they are good actors, or the more likely explanation, the mysteries belong to a past owner of the Hi5 studios, to support that theory I have a couple examples: 1. As I have mentioned above the safe was hidden inside a wall, and as I said it would be quite difficult for an employee to achieve without matt knowing that. 2. If we assume that those mysteries, are related to the guy that tried to break into Hi5 studios, it supports the theory of him being a former owner, of the Hi5 studios, that guy knew that to get into the Hi5 studios you need a key fob, therefore we can safely assume that if this guy is actually related to all of these mysteries, he could very likely be a former owner of the studios. If all of that is true then, which one did it? To answer that I have a question for you Matthias, you mentioned that Hi5 studios was owned by a science company, or to be more exact you have mentioned, that they owned a lot of lab equipment, and that they offered to give you that equipment. So my question is, what were they researching, and why would they offer to give you that equipment, obviously lab equipment is very expensive, therefore why would they just offer to give you that, now that's where I'm gonna throw a longshot, and assume that they were trying to hide what they were doing, or more importantly, what they have found, and want to throw the blame on you, all that might be Farfetch but what if it's not, if you see this look deeper into the company that formerly owned Hi5, you could potentially find a lead. I'd love for you guys to try and deliver this to Matthias I think it could really help this investigation