Post-apocalyptic story about searching through post office

A friend wrote:

This description doesn’t ring a bell with me. Can anyone identify this story?

A Letter from the Clearys by Connie Willis.

Just read this on Thanksgiving day. It’s in her short story collection Fire Watch.

Thanks!

Is it good?

I read it in middle school and it stuck with me. So I’d say it’s good. It also won the Nebula Award for best short story of 1981 & 1982. So that’s another vote for “good.”