Thanks for the info BW!
My brother has a big boiling once a year - does about 400 pounds worth and has his shipped just as you do.
One year he ordered and had the craws sent to his house several days before he was to have his party...then put them in a big tank with CITY water and no aeration - when I told him I thought the chemicals, etc. would kill them, he just told me to shut up.
...So, I spent quite awhile fishing out 400 pounds of dead craws from that tank and putting them in his freezer - he didn't have a boiling that year...but I had what turned out to be a 3-year supply of the absolute BEST jug-fishing bait ever!