Watch boxes?

Those of you that have several watches, what do you do with the boxes? Do you toss them? Keep the watches in them? Have you gone to the length of buying a multi-slot case to store them in? I’m up to 6 now and bought an 8 slot case that I intended to make a boom box out of that may actually become a watch case. But, if I do I don’t really want to keep empty boxes lying around.