I got 250 crates rn, got prob over 300 in ~15 hours :D (Only grinding for ~2 hours, macroing the rest)
Side tip: For people who don't have corrupted kodamas and don't wanna go for em, try just 8 normal kodadas (a lot easier to get), and then place all your serenities and zenflares, and harvest them, and donate them to the zen channeller, easy way to grind zen packs/eggs.