[I_BE_WILL]

i suspect different maps for different DLC perhaps?
the map i have is the EB Games AUS "Pride of the West Indies" and will unlock
-Golden Dual Swords
-Teasure Hunter MP skin
-Special Wheel
-MP Relic

JB Hi-Fi also has the same DLC but is called "Trove of Mystery" and from what i can make out in their images, thats exactly what the map has written on it.

Mighty Ape's map is called "Castaway's Treasure" and contains
-Captain Kenway's Legacy
- 2 MP maps