Credits to Scourge.

Sales

Sale 1: Untrace

https://backpack.tf/profiles/76561198871163068#!/compare/1590796800/1590883200

https://backpack.tf/profiles/76561198171383150#!/compare/1590278400/1591315200

Sale 2: Untrace

https://backpack.tf/profiles/76561198171383150#!/compare/1591315200/1591920000

https://backpack.tf/profiles/76561199055243422#!/compare/1591660800/1591747200

Sale 3: Untrace

https://backpack.tf/profiles/76561198146259385#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198219708161#!/compare/1592265600/1592438400

Sale 4: Untrace

https://backpack.tf/profiles/76561198219708161#!/compare/1592524800/1593129600

https://backpack.tf/profiles/76561198200309337#!/compare/1592524800/1592611200

Sale 5: Untrace

https://backpack.tf/profiles/76561198200309337#!/compare/1592611200/1592697600

https://backpack.tf/profiles/76561198953299555#!/compare/1592524800/1592784000

Sale 6: Sold for Stormy Nickel(13.5)

https://backpack.tf/profiles/76561198953299555#!/compare/1592784000/1592956800

https://backpack.tf/profiles/76561199029369538#!/compare/1592784000/1597708800

14 keys~

B/o was 16 keys.

https://bot.tf/stats/listings/4KVLOEK1

Sale 7: Sold for 11 keys

https://backpack.tf/profiles/76561199029369538#!/compare/1593129600/1593302400

https://backpack.tf/profiles/76561198286257338#!/compare/1593129600/1593216000

Sale 8: Sold for TW Rouser(12) + 7 keys

https://backpack.tf/profiles/76561198286257338#!/compare/1593475200/1593734400

https://backpack.tf/profiles/76561199049545347#!/compare/1593734400/1594080000

12 + 7 = 19

B/O was 17 keys, going to cap at that.

https://bot.tf/stats/listings/MNR0JDGQ

Sale 9: Sold with 11 ref for Miami Hetman's (Sellers at around 10-12~)

https://backpack.tf/profiles/76561199049545347#!/compare/1593734400/1594080000

https://backpack.tf/profiles/76561198137909800#!/compare/1593734400/1593820800

11 keys~

Sale 10: Untrace

https://backpack.tf/profiles/76561198137909800#!/compare/1593907200/1593820800

https://backpack.tf/profiles/76561198080179568#!/compare/1593993600/1593820800

Sale 11: Sold for 17 keys

https://backpack.tf/profiles/76561198080179568#!/compare/1596067200/1596153600

https://backpack.tf/profiles/76561198847569292#!/compare/1596067200/1596844800

Sale 12: Sold for CTFL Eyewear(15.5)

https://backpack.tf/profiles/76561198210780536#!/compare/1591574400/1592265600

https://backpack.tf/profiles/76561198118106215#!/compare/1592092800/1592265600

16 keys~

Sale 13: Untrace

https://backpack.tf/profiles/76561198118106215#!/compare/1592784000/1593216000

https://backpack.tf/profiles/76561198894006431#!/compare/1592352000/1593820800

Sale 14: Traced 2 keys

https://backpack.tf/profiles/76561198184109349#!/compare/1593734400/1593907200

https://backpack.tf/profiles/76561198983415087#!/compare/1593561600/1594339200

Sale 15: Sold for 15 keys

https://backpack.tf/profiles/76561198084554880#!/compare/1591833600/1592092800

https://backpack.tf/profiles/76561198273241056#!/compare/1592006400/1592179200

Sale 16: Sold with 21 refined for Blizzardy Dogger(14.5)

https://backpack.tf/profiles/76561198273241056#!/compare/1592265600/1592352000

https://backpack.tf/profiles/76561198158035421#!/compare/1588377600/1592352000

14 keys~

Sale 17: Sold for 16 keys

https://backpack.tf/profiles/76561198080179568#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198967535754#!/compare/1591660800/1591833600

Sale 18: Sold with 8 ref~ of items for C9 Modest Scrap(14.5)

https://backpack.tf/profiles/76561198967535754#!/compare/1594512000/1594684800

https://backpack.tf/profiles/76561198194080319#!/compare/1593907200/1594684800

14 keys~

Sale 19: Untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198106425214#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198072374854#!/compare/1590105600/1591056000

https://backpack.tf/profiles/76561198072374854#!/compare/1591056000/1591488000

https://backpack.tf/profiles/76561198078018027#!/compare/1590969600/1591056000

Sale 20: Untrace / Bulk

https://backpack.tf/profiles/76561198279706201#!/compare/1591488000/1591401600

https://backpack.tf/profiles/76561198037674114#!/compare/1591315200/1592006400

https://backpack.tf/profiles/76561198850274253#!/compare/1592611200/1592697600

Sale 21: Untrace

https://backpack.tf/profiles/76561198850274253#!/compare/1593129600/1593216000

https://backpack.tf/profiles/76561198874165677#!/compare/1596672000/1596931200

Marketplace

https://marketplace.tf/items/tf2/30001;5;u61

July

$39.99 on July 18 (39.99/2 = 20~)

Listings during the time: https://bot.tf/stats/listings/4O921QKQ

Classifieds

https://gyazo.com/be85ded350e0cf9f99cd806646d05f60

Sellers at at 14.5~ and 20~.

Buyers are up to 11.74~.

Summary

Sales at 11, 11, 11, 14, 14, 14, 15, 16, 16, 17, and 17.

Marketplace sale at 20.

Conclusion

Going to exclude 11 due to quite a few current buyers at above.

Due to past sellers during the time of the marketplace sale, going to exclude 20.

Going with 14-17 here.