The best thing your retainer has found.

Last night, had my retainer bring me Murderous Mogfists. Not sure if I can sell them on the MB as I don't play as a Monk. But awesome none the less.
What random treasures has your retainer brought you?

Thornmarch weapons not tradable so can't sell em.

My retainer found 2 Floss Silks so far, 1 mil each on my server.

My BTN retainer brought back a White Raven Armor Fragment some weeks ago. Sold that thing for a hefty chunk of gil.

(Still jelly that my retainer beat me to T9...)

Jute Seeds

CUL stove for our FC's "kitchen."

Doors, my retainer has brought me back like 3 different kinds at this point none of which I remember the names of and none of them are of any real value on MB but I got them.

ilvl 70 weapons and ilvl 55 rings, some being for PvP.

Moogle Axe, Moogle SMN book, 5 different i70 Warwolf pieces, White Raven Armor Fragment to name a few. I've done a quick run as often as it will let me on my retainers. It's hard keeping tokens in stock :)

I don't know if I should mention my Carbuncle Chronometer or the Broombrush Seeds.

Fish. All fish.

But on a more serious note, nothing spectacular just somewhat expensive mats and and housing items.