Yesterday (November 16) my wife received a check in the mail that was sent in mid-August. Other mail from the same sender, both before and after, had arrived promptly. The extra barcodes on the envelope, some of them crossed out, are somewhat interesting...
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Here's an image of the most interesting markings. There are no markings like these on the other mail from the same sender that arrived promptly. Note that there's a mark from "LOUISVILLE KY 400" on 19 AUG that is overwritten by another "LOUISVILLE KY 400" mark from 28 OCT.
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In other postal service news, I just today (January 19, Palo Alto, CA) received a standard-sized first-class mail envelope, postmarked Philadelphia, PA on December 26. A few years ago first class mail between Philadelphia and Palo Alto typically took 3-7 days. Now 24!

Jan 20, 2021 · 4:19 AM UTC

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Replying to @davidbaron
Got a check that was mailed in August delivered two days ago (also in Palo Alto, CA). Unfortunately I didn't keep the envelope to compare notes.