There's no return address on the box the snakes were shipped in?
I house my ball pythons in 41-qt tubs in a rack. Boas will need a lot more space, I would start to save up for the appropriate-size enclosure from a company like Animal Plastics, Boamaster, ConstrictorsNW, etc. Fortunately you have a few years.I don't know if this is at all possible, but can bins be used for adult snakes as well?