I ship regular mail and only get delivery confirmation. So far everything I have shipped has made it just fine.
So, where do you get your boxes? USPS has the Priority and Flat Rate for free, but if you dont ship that way and go regular mail, where do you get the boxes?
Go to walmart, the grocery store, or any place else that gets truck orders and they will let you get them for free. That's where I got the box I shipped in last month. You just need to make sure to cover any labels or markings that are on the outside of the box.
A small square shaped box will hold 8 or 9 standard sized eggs, and the shipping is >$6 priority. The dimensions were about 6"Hx5"Wx4"D.