The patch is small, about a fingernail in size.
Elsewhere on the packet they used two colors of ink: a very dark blue (this) and a lighter blue. I expected it to be some kind of alignment pattern, but only one of the inks seems to have been used here, so that's not it...
What is it for, why would they bother printing it? An ink+paper resolution/absorption test?
Maybe something for checking the calibration of the high speed cameras on their assembly line?
I agree. This seems like some sort of calibration image. Whether for the printer, the cameras, or both.