Thanks for query,
As there is no problem for breathing,swallowing and discomfort in chest,it might have gone into the stomach.
Gradually traveling through GITract it will come out through stool.
So observe for progress of going down.
Observe for pain in the abdomen,vomiting
.If any thing of this type you found take him to ER.
Mostly within 3-4 days it will come out.
Ok and bye.