From what I've heard that's how people get caught. USPS needs a warrant to open a package sooo unless there's something suspicious about the package it makes it's trip safe.
yeah I work for fedex. they wont search your box for sh*t if it's staying in the country or being shipped from inside the country, as long as there's no smell or doesnt look real beat up you're fine bruh
I'd be more worried from the website I'm ordering it from, be nervous the feds control it or something. I know a few guys that got knocked ordering steroids online (they ordered it from china, not from inside the US) fed dresses up as a delivery dude, as soon as you sign for it they arrest you.