Milk gravy and collard greens may have reflection light spectrums that were not in the spectrums chosen for display in the image. My guess would be that the scientists are planning to show up and eat dinner before others realize their sleight of hand.
Not releasing the Milk gravy and collard greens spectrums so you could have first dibs, does make total sense.
Someone needs to check the cornbread and/or biscuit spectrum too.