I'm not familiar with that term o.o; Black Paper? but no hit [0/15/35/0|0]. I just wanted to get the hard one out of the way and hunt the Shouren (w/hit) during rare enemy week .-.
Black Paper Deal is a quest in Episode 4. By giving a Photom Crystal to the Quest NPC, you get transported to a special area where you can fight monsters. Fight them all and you get random rewards. BPD 1 has 1/2/3/4 items per difficulty (N/H/VH/U), including duds in the shape of Meseta; and it has different routes you can take. BPD2 has 1/1/2/2 rewards. https://ephinea.pioneer2.net/black-papers-deal-drop-charts/
Hunting Milla the old-fashioned way is not recommended. Just equip the Guld (which you have to actually drop) and equip it. That way, you will get the %s of your Guld transferred to your Guld Milla.
Of course, you can always hope for a Hit Milla, but the chance for that is extremely low.