What is the ruling concerning the devices remaining with my husband from Toshiba Company, which the company did not request to be returned after the contract ended, bearing in mind that he cannot return them now?

The remaining devices with your husband are the property of the company, and he is not permitted to use them or dispose of them. He must return them to the company if he is able to, unless the company authorizes him to own them. If the company does not authorize him and he is unable to deliver them, he may donate them as charity, or keep them and donate their value as charity.