i let mine out in the shed every day if i can , i have found that ferrets love the smell of new things and cant resist investigating , myne soon get bored with what ever i put in the shed or cages ,i find it important letting them out at the moment as they are seperated , go to a carpet shop they will have tons of cardboard tubes around the back the new smell will be iresistable to even a big old lazy hob ,and when they get bored just recycle em an get new ones , an old watering can, old leather footballs with holes in cut like flaps when they get bored of them i put them in the other cage the