Wait to open a package : DarknetMarketsNoobs | Torhoo darknet markets

if it makes you feel better and your spider senses begin to tingle yes sir sit the package to the side like you do not know what it is about and write return to sender on it and wait as long as you want. and then after that may be even begin to "drive it to the post office to drop it off to be returned to sender" but not really. drive to a park. walk out in to the woods with it. open it. burn the packaging. and then enjoy the procurement of your contraband. all while your cell phone stays turned off and in your Faraday bag at home. and your GPS modules and satellite and cellular communications physically disabled on your newer model car. all while you are running your GPS jammer that is attached to the bottom of your car that you can decouple at a moments notice.

DO the DRUGS and your question shall answer itself.

jolly roger said 72 hours and claim you were busy if someone shows up in that time

If you make it out the PO doors and to your vehicle without getting arrested you are in the clear. I'd say do the opposite: Open it as soon as you get in your car and drive away from the PO, hide the contents, peel the shipping label off and tear it to a billion pieces, then the cardboard envelope, and throw it in some public trashcan.

If it made it to you hands without LE coming to your door, I'd say your fine.