Would Firebrands drop the flamekeeper cordon even though I'm lvl 150?

Near as I can tell, the "drops only from mobs your level" items are being filtered by the client, not the server. They are there, but they can't be seen if you're not the right level.
I say this because I was training a mule at Kerning Square, and brought in my main with the looting pet to act as vacuum cleaner. She could easily see and pick up the maple leaves and ice cubes, but did not see or loot the legend boxes that the mule could see plain as day.

That doesn't at all indicate that it's being controlled by the client.

For the record, certain quest items have acted like that since the dawn of Maple.