Security Camera Problems!?!?!!?

Can someone please help me!!!!
I'm putting in this camera behind the wall. I am doing it in a way so nobody can see the hole in the wall but when i review the tapes all i see is a vid of the locked box i have but i cant figure out a way to make it so i can see more of the room without making a bigger hole. Which i cant do.

See ive had money go missing yet i cant figure out where its going. So i did this. Now its in a small area so the box is kind of close but i think about 3-4ft away from the wall. How can i get it so i can see more of the room and watch the box and who takes my money????