I recently finished A Scanner Darkly by Philip K Dick

Towards the end of the book, a main character named Donna is described as having a lucky rabbit's foot attached to her purse. The rabbit's foot is only mentioned in one place in the novel.

I went on a hike directly after reading the passage mentioning the rabbit's foot. And on the middle of the trail I found, for the first time in my life, a severed rabbit's foot. A rabbit must have had a struggle with a fox or bird of prey in that exact spot.

Not exactly what you're talking about, OP, but a very notable synchronicity that I wanted to mention