Rare Unboxing Find? MacBook Pro

I was just breaking down the cardboard packaging from my MacBook Pro to recycle it, then I discovered something quite unusual hidden deep inside the internal structure.

Underneath the integrated compartments for the charging cable and manual, I found handwritten calculations and notes directly on the cardboard. The notes include area calculations like 15.5 \times 32 = 496 and what appear to be stock counts (like 200, 200, 1800).

It seems like a 'behind-the-scenes' glimpse into the factory or assembly process. Someone was clearly doing manual measurements and math right on the material before it was folded into the final box. Ive never seen this in an Apple product before. Usually, everything is sterile and machine-perfect.

Has anyone else ever found factory scribbles inside their original packaging? Is this a common occurrence in logistics, or did I just find a unique manufacturing outlier?

Or even more interesting, is it some top secret information???