C30 Lost and Driven out

"Only my father left it to me, and I kept it in a frame on my desk."

"But one day last year, when I came to work, the frame disappeared from my office."

"The problem is, my office key is independent. Only I have it."

"The police have also come to investigate. There are no traces of forced locks."

"In the end, this thing disappeared, and there was no follow-up