it's good to know these as i shipped to very valuable snakes to alabama. i shipped them priorioty overnight by 10 am. however, since the person lived in the boonies there was no fedex garuntee until 3 or 4 pm.

i did not know this, but if i would've known the codes, i probably would've caught it.

needless to say the snakes were on the truck all day and got cooked.