e golden souvenir is a golden calice. the ones you find on island 3(normal game) for the other monkey quest. you only need one.
a few tips on finding the eletronic devices:
4 of the monkey quests gives 1.
you can find a few in safehouses around the islands.
you can find a few in the shacks where you have to smash the wall to get into. also some inside some of the locked shacks
theres one on island 3(dlc), where, if you to south to the ledge from the last area and hop down on it, and run to the next and then the next and then the next again. you will end up beside a lava waterfall. cross it, clear the zombies and pick it up from the ground.
i think that was all of them