It is all about knowing the 'rules of the game'. What you have experienced is not bad luck at all. It is exactly how the 'draw' algorythms are designed. You have the most chance on the first few hours of day 1, so if you want to use gold, use it as soon as event starts and keep resetting the timer with gold and opening with gold... Your chances go down as the event progresses. It is quite normal to get stuck at 9/10 or 7/8 for like 3 days... Also, that last weapon that you struggle to find is not the same as what others miss; so that means the theory of 'rare' weapons is not true... when you expect this as the normal behavior of the event, you won't get as frustrated!