Writing, photos of the snakes you have proof of everything. Hope you trust them to some degree because I wouldnt risk it unless I trusted them completely and I would still document everything.

Somewhere in these forums, someone talked about moving cross country and to make it easier they put their snakes in the same tubs and snuck them into hotels at night. The snakes bred on the trip and since then have hatched out the babies.

So consider taking them with you or leaving them with a friend or least someone you now has been in the area for awhile.