Resuggesting, thank you Xergoyf.

Sales

Sale 1: Traced 18 keys + 11 refined

https://backpack.tf/profiles/76561197964171516#!/compare/1595548800/1596067200

https://backpack.tf/profiles/76561198454615761#!/compare/1595376000/1595721600

Buyorder was closer to 19 keys~

https://bot.tf/stats/listings/MLVJ2E1O

Sale 2: 19 keys?

https://backpack.tf/profiles/76561198252999692#!/compare/1591056000/1591142400

https://backpack.tf/profiles/76561198454615761#!/compare/1590969600/1591056000

B/o was 20, the 19 do not match regardless.

https://bot.tf/stats/listings/4J93206X

Sale 3: Untrace/Bulk

https://backpack.tf/profiles/76561198087763379#!/compare/1594684800/1596326400

https://backpack.tf/profiles/76561199031142463#!/compare/1595894400/1596153600

Sale 4: Sold for 19 keys

https://backpack.tf/profiles/76561198137909800#!/compare/1593388800/1593475200

https://backpack.tf/profiles/76561198087763379#!/compare/1592956800/1593734400

Sale 5: Untrace

https://backpack.tf/profiles/76561198081172172#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198080179568#!/compare/1592611200/1592697600

Sale 7: Untrace

https://backpack.tf/profiles/76561198150761393#!/compare/1597968000/1598054400

https://backpack.tf/profiles/76561198054270952#!/compare/1597968000/1598054400

Sale 8: Sold with 2 keys for Cloud9 Company Man (20.5 keys)

https://backpack.tf/profiles/76561198954908705#!/compare/1597881600/1597968000

https://backpack.tf/profiles/76561198150761393#!/compare/1597881600/1597968000

20.5 - 2 = 19 keys~

Sale 9: 20 keys?

https://backpack.tf/profiles/76561198140151738#!/compare/1597881600/1597968000

https://backpack.tf/profiles/76561198954908705#!/compare/1597881600/1597968000

Histories/ID's do not match, but the b/o was same

https://bot.tf/stats/listings/4WX236Q0

Sale 10: 19 keys?

https://backpack.tf/profiles/76561198195933333#!/compare/1597881600/1597968000

https://backpack.tf/profiles/76561198140151738#!/compare/1597795200/1597881600

No buyout found, nothing matches.

Sale 11: Traced 35 refined

https://backpack.tf/profiles/76561198099243560#!/compare/1597881600/1598140800

https://backpack.tf/profiles/76561198195933333#!/compare/1597795200/1597881600

Sale 12: Untrace

https://backpack.tf/profiles/76561198053809624#!/compare/1592611200/1593043200

https://backpack.tf/profiles/76561198454615761#!/compare/1592524800/1592611200

Sale 13: Sold with sweets for Hearts Shanter

https://backpack.tf/profiles/76561198236030772#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198053809624#!/compare/1592006400/1592611200

Using over there: https://backpack.tf/suggestion/5f414c63a96f3f36af552052

Sale 14: Sold for DP Citizen Cane + 3 keys + 9 refined

https://backpack.tf/profiles/76561198077730629#!/compare/1591660800/1591747200

https://backpack.tf/profiles/76561198236030772#!/compare/1591747200/1591833600

The cane is unpriced, and with fewer sales, gonna use there.

Sale 15: Untrace

https://backpack.tf/profiles/76561198087448314#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198077730629#!/compare/1591660800/1591747200

Sale 16: Untrace

https://backpack.tf/profiles/76561198418349197#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198087448314#!/compare/1591142400/1591228800

Other exchanges, such as tradebacks, mannco, scrap, qs store, and etc.

https://backpack.tf/item/9052191851

https://backpack.tf/item/8427227267

https://backpack.tf/item/6931249079

https://backpack.tf/item/9086926739

Bot.tf

https://bot.tf/stats/item?def=30658&q=5&ef=Vivid%20Plasma&craft=1&aus=0&ks=0&source=browser_script

https://imgur.com/a/GWCJpqM - bot.tf stats: sale 1 was actually 18 keys ~44 ref, confirms 16 purchase as well

Overall buys at 15, 16, 17, + the ~19 one

Marketplace

https://marketplace.tf/items/tf2/30658;5;u16

$39.73 / $1.84 = 21.59 keys

$40.13 / $1.83 = 21.93 keys

At least 1 (maybe both) of these was Natali's/D Alex's aka had a b/o of 19.

https://backpack.tf/item/8427227267

https://backpack.tf/item/7092067269

Classifieds

https://gyazo.com/4b75fec7a627f29277375d7475b4ccef

Summary

Sales at 19, 19, and 19.

Marketplace sales at 22 and 22 (at least 1 had a buyout of 19).

Bot.tf sales at 15, 16, 17, and the 19 key one.

Conclusion

15, 16, and 17, were all to buyorders and 2 of which are under current buyers.

22 is likely high due to current and past sellers at less.

Going with 19 flat here.