Up till now I've had my TFC collection boxes high up on a shelf out the way in the living room. I took one down this morning to show a friend and the box looks slightly yellowed. I think because the boxes are white, and discolouration is more apparent. I don't want to have to box them up and not have them on display but I don't want them to go a dodgy colour. I'm guessing a display case of somekind out of the sunlight is the best I can do?