Thanks for taking a look at it! Good question! In the adventure background on that first page it mentions Gan breaking free and smashing one of the shrouds. When PCs get to his cell, the only thing in chains is his severed arm.
Haha, there is a lot of wealth in this monastery! I wrote it to work easily with OSE where treasure is needed to level up (and a LOT of treasure as PCs get to higher levels). I definitely felt like I was stuffing treasure in every crevice I could to meet the expectations of that system, but I think it led to some interesting bits like the golden coffin.