I’ve always had good luck with FedEx next day to where I’m going. Mailed the day before or the day I leave town. No time to look at packages as long as they don’t stink. I send documents to myself
Or if you purchase an item off of a shelf somewhere, and insert what what you want, and reseal, and ship.
Not saying an air conditioner, but you get the idea.
But its also not suspicious.