Actually, I think the person spying through the cave in VV1 is one of the old villagers, not the guardian. Why? Read this quote carefully:
"We are sure now that somebody is practicing magic again and even restoring artifacts! We will find them at once. We are leaving the children under the guard of Tofo alone. We leave tomorrow."
The fresh berries would of been the food for the villager that is spying in the cave.
For the gong, the villagers may have thought that someone was using the gong as 'power'. If not, they may have thought that they should dismantle the gong because Tofo could not handle too many children, and one may bang the gong. The gong is also dangerous.