had a very hard time finding the admirals key in City of Abandoned Ships, until I did replace the key model with ladders After that I did some playing around with the locator in the game and did some treasure hunting for the key spawns.
This is what I found out and I've also included pictures. The purple "circles" are the key spawns (I think. At least I found my key on one of them. Could anyone confirm these spots if they've found their keys on these spots?