I need some help and i was hoping you guys could help me there's a letter i found at the castle it's from a court jester it says there is some kind of technological wonder and that its in the northernmost bench in the music room i looked around in the music room for 1 hour and i cant find it (a screenshot could be helpful),there is a cave in town its surrounded whit bushes and small
trees inside there's a lever and a box but i cant get to it there is mud by the looks of it there's a bridge leading from another way through i don't know where the entrance is to get to the box,and how can i get through the big bad wolf hope you guys can help me

[Edit]:Never mind what i said about the letter i came to a point where i have a iron key for the cupboard and i need another key for the box there is a problem though the iron key wont open the cupboard and where is the key for the box?