Oh, so that's were that went.

I just found the pumice stone that had been missing from the shower for a while.

In Jolly's sock drawer.

Of course.

Now he is chewing on a sachet of facial blotting papers. I don't think rice paper and cornstarch powder is likely to be harmful, but I have no idea where he found it.

[Edited to add: Jolly, if you decide in your preteen or teenage years to hide stuff from your parents, be advised that the sock drawer is so cliche as to be expected, perhaps even more so than "under the mattress". I don't know why that wasn't the very first place I looked!]