At what point do I remove the hides from my enclosure?

I have my BP's in 15qt tubs, their weights range from 150gr to 250gr. I have the appropriate size hides for them but at times I see some of the larger snakes not using their hides.
So what do you recommend?

Ive been putting the hides in for about 2-3 weeks then take them out. My newest ball only used his for about a week and half then stopped. I took his out and no problems. I have no hides in any of my tubs.

As soon as i switched to tubs i stopped using hides all my bps except one are at the almost 100g or above mark. Only have one thats almost 70g and none of them used their hides so i took em all out

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Some of mine have them, some don't. If I see them regularly sitting on top of them, I take them away. But I have a few adults who seem to really like them so I just keep sizing up, same for the babies.