Where is the lost and found office of Beihang University?

Are you talking about the property of the teaching building? If you lose something in the teaching building, you usually go to the property office on each floor to find it.

If you lose your student ID card, you usually go to the network center on the second floor of Block F of the new main building.

Or you have your accommodation information or department information on that thing, just look at the building management of the dormitory or the guide room in your department.

Lost and found. . . . . What a remote place. Having lived here for four years, I didn't know Beihang University still had a lost and found office.