What difference does it make, Biden has double digit lead and Trump can't campaign, probably can't have the next debate. So if you trust CNN and ABC it is a done deal.
I realize Los Angeles County is an outlier in many ways, but here are the drop box locations. Only one for the whole island of Catalina! My nearest one is 3 blocks away. The spouse used it yesterday; I'll get to it soon.
The boxes themselves look pretty secure. There's only a slot wide enough for a fat envelope. And it's under a hinged lid that would make any kind of tampering difficult.