On the third day of work, the department director called me into the office and said that last Friday a bid document was lost, and someone saw me leaving last.

I said I didn't.
He said the surveillance was broken, and asked me to explain why I was the last to leave.
I said I was working on revising the plan.
He asked who could prove it.
I said no one.
He said then you must have stolen it.
I looked at him.
Then I asked, how much is the bid document worth?
He said it's not about money.
I asked, give me a number.
He said, can you afford to compensate?
I took out my work ID from my pocket, placed it on his desk, and said, I can't afford to pay, but I can resign.
Write on my resignation certificate that I was dismissed for stealing the bid document—if you dare to write it, I will accept it.
He was stunned for a moment and said, what kind of attitude is this?
I said, aren't you looking for a thief? I am giving you one.
But I tell you, I didn't steal the bid document.
You can write now that I won't leave.
He didn't write anything.
I took back my work ID, hung it around my neck, and walked out of the office.
Everyone on the floor was watching.
I sat back at my desk, deleted the resignation letter template, and created a new document titled: "Internal Investigation Request Regarding the Disposition of the Bid Document Last Friday."
The first line read: "Please retrieve the department director's office access control records from one hour after last Friday's work end."
That day, the blinds in the director's office were pulled down.
Later, I heard he came back that night to retrieve his personal seal left in the drawer.
The bid document wasn't lost; he locked it in his cabinet and forgot.
Later, at the all-hands meeting, he said it was a misunderstanding.
I didn't look up.
I added another line to the document: "Misunderstandings don't need explanation, but after explanation, please return the personal seal to the company's safe."
I'm still at that company now.
My work ID hasn't been changed; it's still the one from my first day.
I never received the resignation certificate that explained why I left.
But the director's personal seal has never appeared in his personal drawer since that day.