After you've left the bank begin your journey to the Photo Studio (point number 5 on the map). Once you're there ask Elizabeth to open the door and enter the studio. Explore this entire location before opening the last tear. There are some items at the back of the studio, including a new locksmith's set.
Once you're ready open the tear, listen to its "content" and collect Voxophone #68 that will appear in its place.