The last key!

We are down to the last key launching the self destruct system! Good work people!

I got a message in twitter from a friend that the hint to the last key is: "This is the most important activation key. There are no hints available. You just have to know it"

Looks like Richard is already heading back, so we are running out of time. Anyone have any ideas what could be the most important thing that Richard is talking about?

Message #7, part 3

Yes. My hunch was right! There was still more to that message. I'm almost 101% certain that this picture is also somehow linked to the previous two pictures and obviously looks pretty much the same as the first key. But what's the point of the key if the message was already solved without it?

Message #7, part 1

We are living strange times at work. The new "Divide and conquer" policy makes it even harder for me to get any new messages. Apparently the big guns of the company have discovered the importance of them. More specifically they have realized that these messages contain something that is not so beneficial for the business. Therefore, they are becoming increasingly suspicious with anything related to the messages and they are only giving little bits of information to one person at a time, hoping that no-one would grasp the big picture (other than themselves obviously).

Therefore, the picture below is the only thing I was able to find at this time. I know it should be used for something, but the rest of the something (whatever it is) was distributed to a different place, so I have no access to it at this time. But I'll keep working on it!