FearLess Cheat Engine

You should sell any maps you spawn and immediately buy them back so that it counts as obtaining them (and gets rid of the NEW marker), but besides that you should be fine. I had trouble with two pirate encounters (don't remember which ones) but after giving myself the maps, then saving and restartin...

@Bizonchik, try editing empty slots into maps instead of other items, it worked for me. The item codes I used were from the table here ([Link]), so, if that helps as well.