Tom; are you referring to pneumatic staplers/staples?
Products - Prime Fasteners
Products - Prime Fasteners
Like Doug says you can buy a neew tool and you will be working in a small area so you might consider one of these or something similar:Wood screws.
I think they used staples as a manufacturing shortcut. With the forces on a drawer 2 screws would probably stand up better than staples.
You can still buy a new tool, get a set of gimlets, they make starting the screws easier
https://www.amazon.com/4-Piece-Giml...ie=UTF8&qid=1503859579&sr=1-2&keywords=gimlet