[Natalya]

I work in ecommerce, we ship boxes full of fragile heavy stuff (usually stained glass) every day. If he sent it in a box that big he is a dipstick and doesn't need to be in the business of selling stuff on the internet. It probably did cost him $28 at the UPS store.

If you want to mail something that weighs more than a pound cheap and fast and reliably you stick it in a USPS priority mail box or envelope, tracking included.

If you have something weighing less than I think 14oz stick it in a bubble mailer and ship it USPS first class. (Almost everything we ship is over a pound so I forget the cut-off for USPS first class.)



A bar of gold weighs <28 pounds and should fit inside a USPS Medium Flat Rate box which costs approx. $14 to ship anywhere in the USA.

HOWEVER,
You can only insure USPS Priority Mail (like the MFR box) up to $5000. Meanwhile, a bar of gold is worth approximately $500k at the moment. So, no, you wouldn't pay $28 to ship and insure a bar of gold, you'd have to pay way more to get it insured.