HL-2280DW Printer spring laying inside...where does it go?

I am replacing the feeder cam and there is this spring circled in blue just laying here. It doesn't go in this vicinity. Where does this part go? Can anyone help me out? Looks like there is only one spring like this in the service manual called a "FG Spring Regist". There are no more I can see, maybe this is an extra left over from production?