I've had a bad case overthinking stuff in vidyagaems.
And I can't imagine a better place to share it, to get it out of my system.
Every time I launched Kingmaker, this envelope seemed somewhat wrong to me:
The seal looks out of place, because it does not prevent the paper from being unfolded and as such does nothing to ensure confidentiality of the message.
Placed like this, it could only serve as a kind of signature, a "royal stamp".
But then what is the point of the rope cord?
What's worse, anyone with a sharp knife and a candle can just cut the seal right off; and then reattach it to any fraud document.
After a brief consideration, I believe that the cord is supposed to bind the top and the bottom flaps together.
And the seal covers the binding spot.
This way to open the envelope you have to either pull the rope out (it's even additionally chipped) breaking the seal in the process;
or cut the rope between flaps without a chance to hide your tampering due to the seal holding the cut-out ends.
So I guess the envelope was alright after all. )
I dunno, maybe it's an obvious thing to anyone who deals with paper envelops, but kudos to Owlcat artists if they knew what they are doing, and not just painted a sealed envelope.