YES
Yes you can!
Because Korean packs are only 5 cards and there isn’t a guaranteed holo in every pack the packs can be weighed to find which have the holos!
Most packs will weigh around 8.80 grams while holo packs will weigh around 8.90 grams. There should be about 6 packs with holos in every Metal Raiders booster box. So if you get a box without any holos then you’ve been screwed over.