I personally got it in my mailbox as mentioned by Phan. I know I received 1 Seal Scroll. I can't recall the coins, cause when I saw the Seal Scroll, my mind already turned off with joy that I got 1 to begin with.

Anddddddd other than this reward for bug reporting, I think the Devs got a bigger problem with the Mission Gift Boxes side, which requires more work and priority, considering we're talking real money spent there... Lots of real money. :lol