Learn what "they must have fallen out let me check" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the items probably fell out and is going to look for them.
From I Think My Wife Wants To Kill Me, Episode 32
He guesses the missing items must have fallen out and offers to check.
Use this when you are making a practical guess and offering to investigate. It is ordinary spoken English, but the full line is too situation-specific for a phrase page.
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