I'm referring to the blue "medical supply"-type drops from Diplomacy missions.
You can't just search for an item name. ("That's exactly what they'll be expecting!" Can't have that, now can we?)
They're not under Crafting Materials -> Diplomacy like they should be. (Plenty of silks are listed here, apparently someone missed the memo when this changed.)
They're not under any other category either. (Although it's possible that because of the borked auction house, nobody's bothering to list them...)
The problem is that Medical Supplies weren't originally from Diplomacy and the GTM just wasn't updated to reflect this. I THINK they used to be from Investigation, next time you're looking, try looking under that.