What sort of enclosure do you have and where in the house is it located? I think that may have quite a bit to do with their use of the hides. I keep my boas in their own room where there is absolutely no traffic and they are in racks that are very dark inside so their entire enclosure is essentially a big hide. If you have a glass aquarium in the middle of the livingroom that would make a huge difference I believe.

Regardless, even if they never use the hides at all like my boas it's not going to hurt anything to have them available.