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You were right, and this turned out to be much bigger than your report. Thank you for filing it.
I closed this saying there's no such thing as a pig's head or a ribbon drop. There is: Pig's Head and Pig's Ribbon are both real items, they're both already in our item list, and between them TEN quests ask you to collect them. Neither was in any monster's drop table, so those quests were impossible to finish. Exactly what you said.
Chasing it down showed the whole drop system was built from the wrong source. Our tables came from one private-server project when they should have come from the one we treat as authoritative. Comparing the two: 3,758 drops were missing entirely across 476 monsters, and 3,237 more had the wrong rate. Ribbon Pig's single most common drop — its ribbon, at 60% — simply wasn't there.
The tables are now rebuilt from the authoritative source. Every rate matches it exactly, and there are no longer any quest items that a monster we've got is supposed to drop but doesn't. Leather from pigs also goes from 20% to its real 5%, so some things will drop LESS — that's the correct number, not a nerf.
Shipping in the next build. When it's up: kill some pigs and you should see Pig's Head (4%) and, on Ribbon Pigs, the ribbon very often. Leaving this in progress until you've confirmed that.