WORK IN PROGRESS
#1 - DIARY PAGE I
The document is locked down in the building that only opens when you do the PASSING THE TORCH TREASURE HUNT at FELICIDAD, PROMISE PEAKS, SIERRA PERDIDA.
It's on the drawer unit next to the TV.
#3 - DIARY PAGE III
Go to the SAN TELMO LIGHTHOUSE, SOMBREADO GORGE, CONUCO.
Get on top of the fort. On the north side, there is a ladder going down.
There's a locked door. Shoot the lock. The document is next to the Libertad Crate.