When you start Chapter 2 you will be in the Cartagena Museum. Your task is to find a specific display case on the 2nd floor, but you have to avoid that until you get this trophy.
Start out by inspecting every display case on the 1st floor by pushing Up on the D-pad when you stand next to them. You'll hear Drake say something like, "Not here" and you'll see the name of the display case.
Then continue up the stairs and inspect the one in the stairs. When you're on the 2nd floor you have to make sure not to look at the display case he's actually looking for (the one in the middle of the room).
You don't have to inspect all of them to get the trophy.