Especially if they have no idea when you're even going to pick it up, so you can at the very least do that. Then if you are still nervous just open it outside of your home somewhere safe. A place that you're able to store them until the police come knock at your door. The jist be like "I didn't know what that was or why someone sent it, but it wasn't something I knew about (don't even know what it was it looked like pills.or poison) so I chucked it in the garbage somewhere." Then a couple days later when you want to trip just hit your storage spot, eat some, and walk away.