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[–] slwsnowman40 0 points 1 point (+1|-0) ago 

Is this something the US postal service has too?

If the USPS has these machines as well, why didn't they detect the substance?

I could see Kikebook having a mail facility. I worked someplace and the phone bill was sent to us in a Priority Mail box. I can only imagine the amount of mail they could receive. They probably get several bags of mail a day.