I allways use the Dice {not the golden dice} to get my drops from these flights. I had no problem in the past by using this bonus i was able to get at least 2 drops with a wave of 8 planes. However now doesn't seam to be the case. Currently i am flying to Ancient Egypt and the drop rate is dismal. I was always told to use this Bonus to get maps as this wasn't a quest flight or a collectible item. I know the drop rate has change on some bonus's. Are others having problems or should i be using more bonus's together with the dice, but i had no problems with the other lower Excavation flights. Like to hear you views from window pc players really but it should make much difference, but my experience drop rates do change from platforms