More recently I got one and kinda wanted to go, but a week prior had to call a number. Called and they didn’t need any jurors that week at all. If I’d ignored the letter from the very beginning it would have been the exact same result. There was no record if I’d called or not. There would have been no penalty for ignoring the letter.

But there are many jurisdictions, and jury duty can be for federal, state, county, probably more. Each one with slightly different procedures.