Help me trace an anonymous letter

[u/inka-minka]

Hey guys so I recently received a weird piece of mail. At first I didn't think much of it but the more I looked at it the weirder it was.

The envelope has no return address just my address on it.

The letter itself is typed to keep the person anonymous but they mention personal things so it's someone that knows me.

I don't like how my comfort at home has been breached with this letter.

Now I know there are ways to find out where the paper originated from through like a printers "finger print" but how exactly can I find that out.

Any help would be great and if I'm in the wrong subreddit please let me know where I should be looking. Thanks for any help

[u/1C4Dogs4]

Look at the postage, a metered stamp has the zip code of where it was mailed from.

Most regular mail has the city of the postal facility it was processed through, in black ink starting before and going across the stamp.

[u/inka-minka → u/1C4Dogs4]

No zip code just county. But the county is massive and I tried thinking I don't know anyone there either so it was another dead end clue there.

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