I suppose it would depend on how Massdrop intends to procure and offer the sleeves for us. But first as an FYI, I know UltraPro standard sleeves come in at least these solid colors:
Black, Blue, Brown, Clear, Green, Light Blue, Lime Green, Orange, Pink , Red, White, Yellow
I believe UltraPro only sells display boxes that contain a single color. It would be up to us, the Group Buyers and Massdrop if an assortment box would be offered. In which case, Massdrop would have to manually mix up the packs for us.
I think a reasonable compromise would be for us to choose, say, 4 solid colors for Massdrop, and then they can offer single color boxes (12 packs of 50 per box) and an assortment box with 3 packs of each of the 4 chosen colors.