As stated above I'm hard pressed to believe that signing for a package is gunna get you automatically arrested on site. If anybody ever came up to my door step and said I have to sign for package I'd fucking damn well do it. Who the fuck would refuse a package like that? The curiosity would cause my psyche to implode. I understand that some people might be suspicious that it would contain something harmful, but the majority of people would not refuse (this may not reflect so much here as we know what can be in the mailcarfentanyone?)
I'd say as long as you have a clean house, don't open it and don't admit to anything you are fine. Signing for a package does not mean any implicit knowledge of what's inside, at most it is accepting responsibility that the post has done its job and delivered the parcel to its destination. This sort of evidence is useless by itself, if they raid you and find no drugs or incriminating tech then they are going to have a near impossible time making a charge stick. The signing for the package is only a piece of the puzzle but one that proper opsec can defeat. What's everyone else think.
The fact that if you sign for a package that is involved in a CD, you can be raided and arrested, is not something you can choose to believe in. There is legal precedent that affirms this....