Landing at Closed Aiport

During a recent cross country, I flew into some rain/drizzle which was a bit too much for my comfort level. I decided I needed to land and wait for things to lighten up. I spotted an uncontrolled airport out my window, looked up the CTAF on the sectional via my iPad, and landed. Hung out for an out until the weather lifted and took off.

After landing at my destination, I looked up the airport I had landed at in the A/FD. The airport is listed as closed indefinitely. Now, the sectional didn't reveal this closed status, and I was not in a position to refer to the A/FD when I needed to get on the ground.

How big a mistake/violation was this? Nobody was at the airport, and I have no reason to believe I was seen, although I did call out my tail number over the CTAF. Should I file one of the NASA reporting forms, or just let it go?

And, by the way, I learned a very valuable lesson about not flying into bad weather.
 
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