I haven't shipped, but I've received twice. Be advised that most shipping companies do "random spot checks" on packages, and I know of one incident where they found the snake and advised the shipper they had to come get it at once or it would be turned over to animal control.
A well known Chondro breeder once told me it's best to label the package "Harmless live reptile" and never use the S word.
Cold packs or heat packs are used according to the weather conditions and animal requirements.
My first Chondro was enclosed in a snake bag and then in a cardboard box with shredded paper cushioning...then an additional outer box with cushioning.
My second Chondro from GM was enclosed in a rubber/plastic tub with soft cushioning, then in an outer box with cushioning.
Neither snake came with hot or cold packs, but then both were shipped at ideal times of the year (late Spring).
Hope this helps?

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1.0.0 BP
1.1.0 Chondro