All Brass scrap from everything we stamp is recycled and sold back to the Metal dealer. We get giant rolls of Brass Sheet metal cut anywhere from 1" to 8" wide.
The rolls are maybe 5’ across.
According to our resident long term stamping Engineer; the holes are used by the stamp press to align the stamping of the blades. These are large, very noisy automated machines.
**So to answer the original question: The holes are part of the stamping operation itself and have no special electrical or mechanical design. **
(I work in the office as I am a Programmer/Analyst and we share the same slab as the Stamping floor. When some of the stamp machines are going the whole building shakes)