Page B of the February 26, 1942, Los Angeles Times, showing the coverage of the so-called <a href="https://en.wikipedia.org/wiki/Battle_of_Los_Angeles" class="extiw" title="en:Battle of Los Angeles">Battle of Los Angeles</a> and its aftermath (lots of articles on people finding dud shells, unexploded ordnance, etc.
LA Times.
1942-02-26
Los Angeles Times via ProQuest (see also <a rel="nofollow" class="external free" href="https://www.newspapers.com/clip/32860377/1942feb26-battle-of-los-angeles/">https://www.newspapers.com/clip/32860377/1942feb26-battle-of-los-angeles/</a>)