All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is impermissible for an employee to use office Equipment, such as a printer, telephone, or the like for personal purposes – such as for his family's needs – except with the permission of his employer.
The Fatwa of the Permanent Committee of Iftaa' reads, “It is impermissible for the employee to use any of the company's equipment or properties for his personal benefit because this constitutes a violation of the rights of others without their permission. The Prophet said: “A Muslim's property is not lawful (for another Muslim) without the former's own free will.”
Hence, before you use the office items of your husband’s workplace, you have to find out from him if his office permits it. If the office permits it, then it is permissible for you to use them for personal purposes; otherwise, you have to stop using them.
Allaah Knows best.