Rewards for finding Hidden Packages:

Body Armor delivered to Hideout(s)                      - find 10 Hidden Packages
Chainsaw delivered to Hideout(s)                          -find 20 Hidden Packages
Flame-thrower delivered to Hideout(s)                 - find 40 Hidden Packages
Hunter appears at Military Base                           - find 100 Hidden Packages
Laser Scope Sniper Rifle delivered to Hideout(s) - find 50 Hidden Packages
Minigun delivered to Hideout(s)                           - find 60 Hidden Packages
Python delivered to Hideout(s)                            - find 30 Hidden Packages
Rhino appears at Military Base                            - find 90 Hidden Packages
Rocket Launcher delivered to Hideout(s)             - find 70 Hidden Packages
Sea Sparrow spawns at Vercetti Mansion            - find 80 Hidden Packages