Adding on here in case you didn't note it down somewhere yourself Nick.
Currently chest mimics are extremely obvious by endgame; my perspective may be skewed because I spend inordinate amounts of time scumming endgame (that is, I have a less-clear perspective on how common chests and chest mimics are before endgame), but at least 9/10 chests that you find there are reliably mimics, and the mimics aren't that uncommon—so you're hardly surprised when you go to a chest in endgame and oh look it's a mimic :/
Adding on here in case you didn't note it down somewhere yourself Nick.
Currently chest mimics are extremely obvious by endgame; my perspective may be skewed because I spend inordinate amounts of time scumming endgame (that is, I have a less-clear perspective on how common chests and chest mimics are before endgame), but at least 9/10 chests that you find there are reliably mimics, and the mimics aren't that uncommon—so you're hardly surprised when you go to a chest in endgame and oh look it's a mimic :/