The blue chest clue says "You leave the bandit hideout, but with souvenir in tow... You decide to leave this with another, until they have the necessary tools and amount of time to repair it."
And the clue in the green box in the slime memories says "There is a puddle of green slime sticking to the top of this memory... You see visions of a distant cliffside lake and overbearing black thong on your groin."
OK. The blue chest is a bit complicated:
It requires you to be caught by the bandit lizards, and then to escape and retrieve your clothes. You'll get some "tatters" that you can take to the blacksmith... and then he'll eventually turn them into a new set of armour for you!
You'd have to go back to an old save in order to unlock this, though... so if you don't wanna go through all the hassle, I can say there'll be an alternative way to acquire this one in the future!
As for the green chest:
You need to be wearing the slimy black underwear, acquired by rescuing the blue-scaled ranger in the forest near the start of the game. So you may also need to go back to an earlier save.
Whilst wearing them, proceed to the East / right, past all the green slimes... until a scene occurs!
You can start a new game, or go back to an old save, and the scenes you unlock will be unlocked in your gallery. So don't worry, you don't need to play the entire game again.
