Learn what "do you know" means, when people say it, and how to use it naturally in English.

It means the speaker is asking if the listener knew about the old letters.
From The Pendleton Secrete, Episode 40
Someone is asking whether the other person knew about a woman sending letters before.
Use this when bringing up a past detail and checking whether someone already knew it. It is natural in conversation and can carry a surprised tone.
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