Something I found, not sure if it's known. With the treasure hunter class, if you just stack a lot of energy regen and always use your special, you can stunlock anything at any level, so even if you're level 50, just with a lot of energy regen, you can go to level "999999999999" and get absurdly powerful gear, amounts of money, and level ridiculously fast.
How do you get lost items? Are they just rare or do you have to be at a certain level? I've also never seen a treasure chest. (Currently farming at level 510)
You must be at least vet rank 1 to find them.