Discovered in rooting through drawers during the Great Dispossession: my first two Social Security cards. In those days, the cards had addresses on them, so when you started a new job, your card had to have your current address on it, and if that had changed, you needed a new card. Here are (parts of) my first two cards, with my first two tax addresses:

My first job with taxable income was at the Reading Eagle newspaper in Reading PA, a job I began in June 1958, when I was 17 and lived in my parent’s house in what was then the Wyomissing Hills section of Wyomissing PA. That was my official home address through my first years at Princeton, where I continued working for the Eagle and had two separate paying jobs at Princeton University. (Along the way I had temporary residences in Princeton NJ — my parents had by then moved on to California, and I was now living independently — and on Reading Blvd. in Wyomissing PA.)
(As soon as I turned 21, in September 1961, I registered to vote at the temporary address in Princeton. And registered in turn at each of my subsequent permanent home addresses.)
Then in June 1962 (when I was 21) it was on to Cambridge MA, where I had taxable income from MIT and from the MITRE Corp. And had a new home address, off Concord Ave. north of Harvard Square, on Walden St.
Then the cards stopped including a home address, so there were no new cards for Urbana IL, Columbus OH, or Palo Alto CA. (And there were temporary residences in a great many places, in several countries.)