2 X-Rays, no rock.
a) I am delusional, there was no rock (I’m pretty certain there was a rock, despite my delusions), or
b) The rock has “passed” (pretty sure that I would have noticed), or
c) The rock wasn’t visible to the machine. It was quartz, apparently it happens.
Anyway, kid is full of the joys of spring, so its very unlikely that there is any harm done. Yet.