Bad cops:

Who in their right mind would ship large sums of cash, for ANY reason.....it could get delivered to the wrong address or a porch pirate could steal it.
Don't think that signature verification does any good either. I recently ordered a hundred 1 oz silver rounds from Pinehurst Coins, they shipped them priority mail with signature verification. They arrived one day earlier than they were supposed to be. I thought no problem, even though I was out of town, they'll just deliver them the next day. Long story-short. The Postal worker forged my signature, said they were left with an individual and put them in my mailbox. Luckily they were still there the next day even though my mailbox is on a busy street with a lot of folks walking by it. I, of course, reported her.