I use it to ship Electronic parts, Optics... should work well for eggs.
I bought a cheap Vaccum wrapper from Wal-Mart, if you V.W. the popcorn into pouches, custom sized to your box, it doesn't breakdown and it is easy to fit it to any size!
From some of the replies, if I wanted, I could order eggs from any of the ones that say they would send more at shipping costs, and fill my incubator for next to nothing! Not that anyone should, you guy's sound like nice people, but a little too trusting.
No PROOF...NO MORE EGGS!
Sounds like a Scammer IMHO, don't let their insults force you to refund/replace anything, from the description of your packing job, you are not a rookie at the shipping! The Buyer is the one that needs to see how the pro's do it. USPS DOES have Damaged goods forms, that the Buyer needed to fill out!
First, how were they sent? UPS? Where are his pictures showing the damage, where is the form he would have to fill out with the shipper claiming damaged goods?
Thare are Claim forms and rules in place by all the shipping outfits that are in place to cover cases just like this.
As far as PayPal...
Anything less than 20-30 minutes should be okay, over that and the temp. probably caused severe internal organ damage. The 90* should not be a factor at all. Colder has to be for an extended (read 1-2hrs) before it seems to impact the embryo.