It's in the first of the options in the dialog with Remains-Silent, the one that also grants alchemy mats or stam or magicka Alliance potions. Got a startling amount of those potions squirreled away, too. I really only use those, trying to somehow use them all up.
Honestly, 166 bound items (and counting) was obviously the inevitable result of this particular loot table. That would fill over one and a half basic homes. With rather hard to see vials of blood. Admittedly I have Shadowy Supplier on 15 characters but even with only one character getting your daily reward will eventually result in a surfeit of these items.