Said nothing to the pretty girl

I (M23) went in to get my birth certificate. The girl behind the desk was very pretty. She kept smiling at me, to the point even a dude as dense as me couldn’t miss the hint. I kept thinking “I should tell her she has a really nice smile” but just politely left after getting my document. That was yesterday. I’m aware these apps are a waste of time, but I just saw her on Bumble. I know I should have taken the shot. But my gut says that shot has passed. Part of me wanted to “lose” my birth certificate so I could actually try this time or just call the office and leave my number, but I don’t know if that’s socially unacceptable/would be uncomfortable. So I’ll seek out extensive advice before doing something that could potentially make someone uncomfortable.