At 2:53 I found the values during testing. The 90 wasn't an exact offset, was a rough idea. That's how I knew roughly the distance and order.
At 3:32 in first video, I'm showing you "headers", as I call them. They are all same value (won't match mine) and typically are what a pointer value is pointing too. I select them to show that this is how you know you are in right location.
At 3:52 that header should be above each reward. And looking at the values and the order, is exactly 5 lines (so 21) from that header to the qty. And between those is two 0s.
Hope this clears things up.
I noticed some other things in the game not in video, other currency type of things. If you need help hacking those, can help.