Thread:Softcorps/@comment-3057068-20160623160639/@comment-3057068-20160623205036

Passing doesn't affect the chest type, only the chance that your party is reverse-ambushed, so passing ambushes and recording would be better. The in-game manual says that repeatedly ambushing in the same area results in higher level enemies, but doesn't say anything specific about chests. It does say that it is a good strategy for collecting rare items, but who knows whether that means better chests or not.