Hit up your local WalMart, dollar store, whatever and grab one of these (they come in various sizes). I have a few of them and they are fantastic for holding snakes while cleaning tubs, moving snakes, taking snakes to the vet, holding live prey for snakes, whatever. Just melt in a few vent holes and you're good to go. The lids are very secure and have a handle for carrying. The come in a variety of lid colors and are very reasonably priced.
I'd pop your snake into a pillowcase or snake bag, tie closed and then put into this sort of container. Then you know it's double safe and can be easily hauled to the new house and left in there safely while you set it's home up.
Bigger size (I vented this one a lot since I use it more for moving live rodents than snakes around)....
Smaller one.....
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