I got the enchanted thread and the dwarven cogwheel. But I forgot to mention I also appear to be short by two Solarite. I have two items which can be upgraded to a Solarite version I think (Willpower ring and Allure pendant) but there are no more treasures I can find. I tried opening several more mystery boxes but I am just getting generic items from them now. Are there two more Solarite available?
Actually based on what Good Dirt said below, it sounds like they just aren't available.