Gold mine.

Sales

Sale 1: Could be 48 keys?

https://backpack.tf/profiles/76561198112281935#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198057029003#!/compare/1583884800/1596412800

Unfortunately histories do not match, so not sure..

Sale 2: Untrace

https://backpack.tf/profiles/76561198036591662#!/compare/1597276800/1597449600

https://backpack.tf/profiles/76561198065805500#!/compare/1597449600/1597536000

Sale 3: Sold for 70 keys

https://backpack.tf/profiles/76561198114402400#!/compare/1600905600/1600992000

https://bot.tf/stats/listings/Y5ZW8DLE

Sale 4: Untrace

https://backpack.tf/profiles/76561198331167728#!/compare/1597968000/1598140800

https://backpack.tf/profiles/76561198167034647#!/compare/1587513600/1600214400

Sale 5: Bulk

https://backpack.tf/profiles/76561198311981931#!/compare/1598054400/1598140800

https://backpack.tf/profiles/76561198331167728#!/compare/1597968000/1598140800

Sale 6: Untrace

https://backpack.tf/profiles/76561199059840687#!/compare/1597968000/1598054400

https://backpack.tf/profiles/76561198311981931#!/compare/1597968000/1598054400

Both bots have same owner. So not a sale.

Sale 7: Sold for 50 keys~

https://backpack.tf/profiles/76561198255399439#!/compare/1597968000/1598054400

https://backpack.tf/profiles/76561199059840687#!/compare/1597881600/1597968000

Sale 8: Bulk

https://backpack.tf/profiles/76561198149388672#!/compare/1597276800/1597449600

https://backpack.tf/profiles/76561198255399439#!/compare/1597363200/1597449600

Sale 9: Untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1599436800/1599523200

https://backpack.tf/profiles/76561198084416692#!/compare/1599350400/1599609600

Sale 10: Untrace

https://backpack.tf/profiles/76561199050999021#!/compare/1598400000/1598659200

https://backpack.tf/profiles/76561198337734785#!/compare/1598572800/1598659200

Sale 11: Sold for 59 keys

https://backpack.tf/profiles/76561198304302520#!/compare/1596931200/1597017600

https://backpack.tf/profiles/76561199050999021#!/compare/1596931200/1597017600

https://bot.tf/stats/item?def=30862&q=5&ef=Burning%20Flames&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/6da4fdf436359437a56d73a3e51e5c9e

Other exchanges such as with mptf.

https://backpack.tf/item/6554530168

Marketplace

https://marketplace.tf/items/tf2/30862;5;u13

July

$110 on July 8 (110/1.99 = 55~)

https://manic.tf/keyprice/?at=2020-07-08

https://backpack.tf/item/5974287094

130 on July 19 (130/1.97 = 66~)

https://manic.tf/keyprice/?at=2020-07-19

https://backpack.tf/item/6274490314

Listings during the time: https://bot.tf/stats/listings/YD1QJ31V

August

$128.5 on August 13 (128.5/1.84 = 70~)

https://manic.tf/keyprice/?at=2020-08-13

https://backpack.tf/item/6759579286

120 on August 15 (120/1.81 = 66~)

https://manic.tf/keyprice/?at=2020-08-15

129.99 on August 15 (129.99/1.81 = 72~)

https://manic.tf/keyprice/?at=2020-08-15

September

$134.99 on September 1 (134.99/1.83 = 74~)

https://manic.tf/keyprice/?at=2020-09-01

199.99 on September 15 (199.99/1.86 = 108~)

https://marketplace.tf/items/tf2/5021;6

https://manic.tf/keyprice/?at=2020-09-15

https://backpack.tf/item/8829283605 ?

82.01 on September 17 (82.01/1.84 = 45~)

https://marketplace.tf/items/tf2/5021;6

https://manic.tf/keyprice/?at=2020-09-17

Classifieds

https://gyazo.com/f5eba67fa6ae5bf44296c794769eaf36

Summary

Sales at 48 (possibly), 50, 59, and 70.

Marketplace sales at 45, 55, 66, 66, 70, 72, 74, and 108.

Conclusion

Going to exclude sales under 53 due to buyers.

108 is probably too high with all the sales at less.

55 is close to buyers, but it isn't below. 3 sales at less supports including 55 here.

Going with a wider range of 55-74 here.