This is a video of the unboxing of the backer version of the physical box of Thimbleweed Park. Only the backer versions are signed by Ron and Gary. The box that anyone can purchase on Fangamer isn’t signed.
If you are still waiting for your physical box to arrive and you don’t know what the box contains, you SHOULD NOT watch this super-spoilery video, in my opinion. Discovering the contents by yourself should be more funny.