they are avoiding it and you have an untainted(by borax) source of water for them. food? forget it. they can eat your house. but water, they must have. the drain pan under the fridge, any moisture build-up anywhere, toilet tanks sweating, kitchen and bathroom drains, laundry rooms, wet towels and shower curtains, any undiscovered leaks behind walls or under the house.... also sources outside close to the house, like a dog bowl, a fish pond, etc.
it will work once you deny them moisture. be diligent and thorough. youre still running a farm if they are there.