Sale 1-2:

https://marketplace.tf/items/tf2/30316;5;u14

$99.99 / $1.78 = 56.17 keys

$68 / $1.75 = 38.86 keys

Sale 3:

untrace / gamble

https://backpack.tf/profiles/76561198101300189#!/compare/1581638400/1581811200

https://backpack.tf/profiles/76561198820335875#!/compare/1581552000/1581638400

Sale 4:

untrace / gamble

https://backpack.tf/profiles/76561198820335875#!/compare/1581552000/1581638400

https://backpack.tf/profiles/76561198284111912#!/compare/1581465600/1581638400

Sale 5:

untrace / gamble

https://backpack.tf/profiles/76561198284111912#!/compare/1581638400/1582243200

https://backpack.tf/profiles/76561198071772361#!/compare/1581552000/1581638400

Sale 6:

untrace / gamble

https://backpack.tf/profiles/76561198071772361#!/compare/1581638400/1581811200

https://backpack.tf/profiles/76561199022754136#!/compare/1581811200/1581897600

Sale 7:

untrace / gamble

https://backpack.tf/profiles/76561199022754136#!/compare/1581811200/1581897600

https://backpack.tf/profiles/76561198087494715#!/compare/1581724800/1581811200

Sale 8:

untrace / gamble

https://backpack.tf/profiles/76561198087494715#!/compare/1582329600/1582416000

https://backpack.tf/profiles/76561198886850124#!/compare/1582329600/1582416000

Sale 9:

untrace / gamble

https://backpack.tf/profiles/76561198886850124#!/compare/1582416000/1582502400

https://backpack.tf/profiles/76561198085197395#!/compare/1581552000/1582502400

Sale 10

untrace - likely buy order

https://backpack.tf/profiles/76561198085197395#!/compare/1581552000/1582502400

https://backpack.tf/profiles/76561198337734785#!/compare/1582416000/1582502400

Sale 11:

untrace

https://backpack.tf/profiles/76561198090710982#!/compare/1571011200/1584316800

https://backpack.tf/profiles/76561198337734785#!/compare/1584144000/1584230400

Sale 12:

bulk

https://backpack.tf/profiles/76561198271721689#!/compare/1581897600/1582329600

https://backpack.tf/profiles/76561198859721638#!/compare/1582243200/1582329600

Sale 13:

using on ushanka

https://backpack.tf/profiles/76561198067967717#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198859721638#!/compare/1585094400/1585180800

Sale 14:

46 keys

https://backpack.tf/profiles/76561198067967717#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198255850609#!/compare/1585699200/1585785600

Sale 15:

50 keys

https://backpack.tf/profiles/76561198255850609#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198081752665#!/compare/1585526400/1585872000

Sale 16:

61 keys

CHeart Modest Pile of Hat(42) + 19 keys

https://backpack.tf/profiles/76561198081752665#!/compare/1585526400/1585872000

https://backpack.tf/profiles/76561198798943946#!/compare/1585785600/1585872000

modest: https://backpack.tf/suggestion/5e95caeb7cdbe532143eea76

Sale 17:

considering he bought the toy solider just to gamble it i think its fair to exclude this sale

DBD lucha

https://backpack.tf/profiles/76561198798943946#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198972294135#!/compare/1586131200/1586217600

Sale 18:

untrace / gamble

https://backpack.tf/profiles/76561198972294135#!/compare/1586304000/1586390400

https://backpack.tf/profiles/76561198986747837#!/compare/1586390400/1586476800

Sale 19:

untrace / gamble

https://backpack.tf/profiles/76561198176022675#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198986747837#!/compare/1586476800/1586563200

Sale 20:

untrace / gamble

https://backpack.tf/profiles/76561198176022675#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198171672427#!/compare/1585785600/1586563200

Sale 21:

untrace / gamble

https://backpack.tf/profiles/76561198171672427#!/compare/1586649600/1586736000

https://backpack.tf/profiles/76561198037674114#!/compare/1586217600/1586908800

==============================================================================

Sales:

39,46,50,56,61

4 month unsold at 80 keys shows current is too high: https://imgur.com/a/vqAGyt0

buyers at 41 keys: https://imgur.com/a/C2SOCWK