If I ship it with USPS, it has to be a WGAS item where I don't care if it gets there or ever gets there. Anything mission critical will NEVER EVER be shipped USPS. I have received a book a month later than it should be. USPS has no clue where it was. One day, it showed up. This is AFTER the shipper refunded the money so I had to refund the refund.
If I ship USPS as your request, I am not going to guarantee that it gets there or in what condition. I will send you proof of postage via an email scan if it comes to that. I ship Fedex Ground or UPS Ground as a carrier of choice.
I have seen less incompetence and the tracking information is way more accurate that USPS. I wouldn't pay a penny more for USPS tracking since it is about as useful as the proverbial teats on a bull.
On a side note about the phrase. Some men have been known to lactate so that phrase might not be as accurate as thought. I mean, doesn't that give new meaning to the word "Milkman"?