This depends on your degree of perversion. LOL
Seriously, I would tape over them with duct tape or something similar. Some folks use silly putty, others use nothing. Personally, I would not want water soaking into the filler. The filler is very porous material so I cover my holes.
--------------------
SIG CHANGED BECAUSE OF A COUPLE OF WHINERS: Two lepers were playing hockey.
They had a face off.