In the last 45 years in the carpenter business I've found half a dozen or so bullets in framing lumber and v-groove cedar ceiling boards.
The last one was in a piece of barn wood I was installing as wainscot. The barn it came from had stood for 80 some odd years and the bullet was in the wood for a while before it became a barn board judging by the way the tree had healed around it.
All those bullets we shoot in the woods go someplace. Someday the one that went through the deer I shot last week might turn up in a board.
That little 4 point whitetail was the 11th buck that died from a bullet sent from that particular WW SuperX casing. It also has two coyotes to its credit.