The reward for collecting all 8 units is better then the 25 assault rifles needed to finish the current event. Im going for it. I have 2 units so far and hopefully i can finish event and get all 8 units for less then 1000 gold. I will post each day with my progress. I use gold to open each case, but i do not reset the timer so i open about 15 a day. Wish me luck.