Here are the offsets for the forgotten temple rewards. So essentially you can change them to give what ever item you wish.
Note: The num from item table is 379155000 which, when converted to hex = 16997238, so to change the item it gives you would find the num from item table and convert it to a hex value then chante the number after the:
MOV DWORD PTR SS:[EBP+8],
004355FA |. C745 08 207699>MOV DWORD PTR SS:[EBP+8],16997620 ; Case 3 of switch 004355EE //Blue Chest
00435603 |> C745 08 387299>MOV DWORD PTR SS:[EBP+8],16997238 ; Case 2 of switch 004355EE //Green Chest
0043560C |> C745 08 506E99>MOV DWORD PTR SS:[EBP+8],16996E50 ; Case 1 of switch 004355EE //Red Chest