Secret Quest reward?

Were those numbers arbitrary at the time of posting? I sorta don't want to end up getting 10k of those things in hopes of something godly, only to have the rewards cap at 1000.

a tip, you can talk to to Mr. Ku and click the quest (dont click next cause it will finish it), and then you can see what hes saying (every reward has something different said). so you can get 2000 and see if he still says "oh hohohohoh etc etc", then worst case you can use 1000 and leave 1000 for a mule or something.