Progress Update: I added special locked doors that will only open if a player finds a key. Planning on implementing puzzle elements to obtain keys. I also added a custom mystery box with the treasure chest music from Ocarina Of Time.
Awesome! I have a small idea that may be easy to implement. You could add pots/jars that players could smash with either their knifes/sword. These could be used to hide keys or items used for your puzzles. All you would need is a normal pot model and a demolished pot model. Then just change the pot model once the set amount of damage has been done to the pot.
Just an idea.
Also, if your not using a custom magic box/crate you could use the one from MOTD (Alcatraz). It looks like a treasure chest and you can even remove the spikes on it in Maya if you want it to look less creepy. lol
Great work so far,
Whippy