What are the idioms in face on milk carton?

The phrase "face on a milk carton" is itself an idiom, meaning someone is missing or wanted. It's not a literal description, but a reference to the practice of putting pictures of missing children on milk cartons, which was common in the 1980s.

There aren't really other idioms specifically about milk cartons, but there are some related phrases:

* "Like a shot in the dark": This refers to a random, unlikely attempt, similar to hoping someone will see a missing person's photo on a milk carton.

* "To be gone without a trace": This phrase means to disappear completely, leaving no evidence or clues, which is the situation often faced by missing persons.

* "To vanish into thin air": Similar to the previous phrase, this describes a sudden and unexplained disappearance.

Let me know if you'd like more information about idioms!