RIGHT - never sign for shit bro! Customs would start the process, correct. But your signature just gives them a slam-dunk in a court-of-law. If you are being set up, then you are going down either way, But your sig will definitely help them prove their case. What is your situation?
Never sign for packages and NEVER do business with so-called sources who sends packs which require a sig.
If you do, you're gettin set up like bowling pin.
As a matter of fact, if you go to the mailbox and you even THINK that you might be being watched - open your package and throw it all into your trash can - then throw a bunch of shit on top of it. This way, if your house gets raided minutes later and they find your stash in the bottom of the shitcan - you'll still get arrested - but it could help you tremendously when you go to court.
"Your honor - I don't know how or why that stuff got delivered to my home - but I thought it might be dangerous - so I disposed of it immediately."
Just make sure to wear baggy clothes it you are swole. lol