Counting my sins!

Sale 1: Sold with 2 keys for Scorching Flames Rebel Rouser (80 keys)

https://backpack.tf/profiles/76561198155659373#!/compare/1587340800/1587513600

https://backpack.tf/profiles/76561198060730062#!/compare/1587340800/1587427200

80 - 2 = 78 keys

Sale 2: Sold for 67 keys

https://backpack.tf/profiles/76561198404491245#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198229219288#!/compare/1586390400/1586304000

Sale 3: Sold for 68 keys

https://backpack.tf/profiles/76561198229219288#!/compare/1586304000/1586390400

https://backpack.tf/profiles/76561197995029705#!/compare/1586390400/1586304000

Sale 4 & 5: Marketplace

https://marketplace.tf/items/tf2/135;5;u14

https://backpack.tf/item/256017756 (Sale 4 and 5)

105 on April 9, 2020 (105/1.69 = 62.13 rounding to 62 keys)

149.99 on May 1, 2020 (149.99/1.85 = 81.07 rounding to 81 keys)

Sale 6: Sold for The Dark Doorway Sky High Fly Guy (70 keys)

https://backpack.tf/profiles/76561198118512004#!/compare/1587340800/1587772800

https://backpack.tf/profiles/76561197994697258#!/compare/1587254400/1587340800

70 keys

Sale 7: Sold for Massed Flies Cosa Nostra Cap (Open suggestion at 13.5 keys) + Kill-a-Watt Crown of the Old Kingdom (35 keys) + Miami Nights Well-Rounded Rifleman (Open suggestion at 41 keys) + 10 keys + 1.5 keys in sweets

https://backpack.tf/profiles/76561198131081286#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198118512004#!/compare/1586044800/1586822400

13.5 + 35 + 41 + 10 + 1.5 = 101 keys

Buyout was 100 keys

https://bot.tf/stats/listings/Y80QNXRZ

Sale 8: Sold for 67 keys

https://backpack.tf/profiles/76561198042520565#!/compare/1585958400/1586217600

https://backpack.tf/profiles/76561198131081286#!/compare/1585872000/1585958400

Cosa Nostra Cap:

https://backpack.tf/suggestion/5ecdc78f799d38148543de74

Well-Rounded Rifleman:

https://backpack.tf/suggestion/5ecdcaaf9e921305fe0d258c

Classifieds:

https://gyazo.com/4858b1dbd000c8983ded92ddce701470

Sales are at 62, 67, 67, 68, 70, 78, 81, and 100. There are quite a few buyers at 66-68. As well as quite a few sellers from 83 to 95. Excluding 62 and 100.

67 and 68 seem to be a common trading point in this case. Not excluding.

Taking a wide range of 67-81 keys here.