N Series Cage Covers

I am getting my N5 ready for soybeans for the first time since I've owned it. The cage sweep is in good shape and is fully functional. The cage did not have any covers in place. According to my manual there should be a large cover on the back all the way on the right side of the machine that can stay in place for all crops except corn. However, this one is missing. Is it important to have or will it not make any difference? Also, it says to install two covers just on either side of the center support. Are those important as well?

I'm only running a 15 foot flex so the combine shouldn't be pushed too hard.

Thanks for any help!