https://steamcommunity.com/market/listings/440/Strange%20Spooky%20Head-Bouncers

Aug 14, 0.0676 keys

Aug 15, 0.07 keys

Aug 15, 0.07 keys

Aug 15, 0.147 keys = 7.77 ref

Aug 15, 0.0662 keys

Aug 16, 0.0706 keys (x3)

Aug 16, 0.0591 keys

Aug 16, 0.0721 keys

Aug 18, 0.0677 keys (x2)

Aug 18, 0.0567 keys = 3 ref

Aug 19, 0.0781 keys (x19)

Aug 19, 0.0879 keys

Aug 19, 0.0572 keys

Aug 20, 0.0666 keys (x2)

Aug 20, 0.0778 keys

Aug 21, 0.0747 keys

Aug 21, 0.0746 keys

Aug 21, 0.0779 keys

Aug 22, 0.0769 keys (x5)

Aug 22, 0.0837 keys

Aug 23, 0.0702 keys

Aug 23, 0.0862 keys

Aug 23, 0.0713 keys

Aug 24, 0.0838 keys (x3)

Aug 24, 0.0731 keys

Aug 24, 0.0872 keys

Aug 25, 0.0878 keys

Aug 25, 0.0881 keys

Aug 26, 0.0854 keys

Aug 26, 0.0836 keys

Aug 27, 0.0859 keys (x3)

Aug 27, 0.0863 keys (x3)

Aug 27, 0.0981 keys

Aug 27, 0.0746 keys

Aug 28, 0.0983 keys

Aug 30, 0.0753 keys

Aug 30, 0.0594 keys

Aug 30, 0.0960 keys

Aug 31, 0.0743 keys (x3)

Aug 31, 0.0908 keys

Aug 31, 0.0868 keys

Sep 1, 0.0878 keys

Sep 1, 0.0943 keys

Sep 1, 0.0994 keys = 5.22 ref

Sep 1, 0.0989 keys (x2)

Sep 2, 0.0784 keys

Sep 3, 0.0908 keys

Sep 3, 0.0943 keys

Sep 3, 0.0909 keys

Sep 5, 0.0779 keys

Sep 6, 0.0777 keys

Sep 6, 0.0744 keys

Sep 6, 0.0862 keys

Sep 8, 0.0856 keys (x2)

Sep 8, 0.0864 keys

Sep 9, 0.0859 keys

Sep 9, 0.0857 keys

Sep 10, 0.0726 keys (x2)

Sep 10, 0.0639 keys

Sep 11, 0.0833 keys

Sep 11, 0.0662 keys (x2)

Sep 12, 0.0506 keys = 2.66 ref

Sep 12, 0.0822 keys

Sep 12, 0.0825 keys (x2)

Sep 12, 0.0893 keys

Sep 13, 0.0858 keys

Sep 13, 0.0856 keys

Sep 13, 0.0899 keys

Sep 13, 0.0991 keys (x14)

Sep 13, 0.0729 keys

https://marketplace.tf/items/tf2/31209;11

Aug 16, $0.14/1.81 = 0.0773 keys

Aug 17, $0.14/1.83 = 0.0765 keys

Aug 21, $0.14/1.84 = 0.0760 keys

Aug 22, $0.14/1.84 = 0.0760 keys

Aug 23, $0.14/1.84 = 0.0760 keys

Aug 26, $0.14/1.83 = 0.0765 keys (x2)

Aug 27, $0.14/1.81 = 0.0773 keys

Aug 31, $0.14/1.8 = 0.0777 keys (x2)

Sep 3, $0.14/1.81 = 0.0773 keys

Sep 7, $0.14/1.8 = 0.0777 keys

Sep 8, $0.14/1.83 = 0.0765 keys

Sep 9, $0.14/1.82 = 0.0769 keys

Excluding high and low end for a tighter range.