Lost Children of the Peninsula

The Lost Children of the Peninsula Tapes are a decorative item that cannot be collected or interacted with, it was added in update v0.45 in The Forest.

Gameplay
The tapes can only be found in the Hidden Stash Room, in cave 2 where the modern axe is located.

Theory
It appears to be a documentary into children going missing. Mostly like linked to the Milk Carton and the Siblings Missing Newspaper which both mention missing children.