Sale #1, Aug 17th:

Bot sale, https://backpack.tf/profiles/76561198046800675#!/compare/1564444800/1566000000

???

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Sale #2, Aug 7th:

Seller: https://backpack.tf/profiles/76561198050933686#!/compare/1564963200/1565136000

Buyer: https://backpack.tf/profiles/76561198122377854#!/compare/1565136000/1565222400

1:1 for this same hat but with burning flames, seems weird, excluding

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Sale #3, Aug 13th:

Seller: https://backpack.tf/profiles/76561198122377854#!/compare/1565654400/1565913600

Buyer: https://backpack.tf/profiles/76561198002757046#!/compare/1565568000/1565654400

Untraceable

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Sale #4, Aug 18th:

Seller: https://backpack.tf/profiles/76561198002757046#!/compare/1566000000/1566086400

Buyer: https://backpack.tf/profiles/76561198066752804#!/compare/1566000000/1566086400

Sunbeams Tavish's Crown (72) + approx. 21 keys in items

= 93 keys

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Sale #5, Aug 11th:

Seller: https://backpack.tf/profiles/76561198158517626#!/compare/1565481600/1565740800

Buyer: https://backpack.tf/profiles/76561198306288794#!/compare/1565395200/1565481600

Anti-Freeze Trilby + 11 keys

Trilby is outdated and can't trace any recent sales on it.

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Sale #6, Aug 25th:

Seller: https://backpack.tf/profiles/76561198158517626#!/compare/1566691200/1566950400

Buyer: https://backpack.tf/profiles/76561198108608612#!/compare/1566604800/1566691200

Bulk for Demonflame Fed Fightin' Fedora, <50% excluding

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Sale #7, Aug 16th:

Seller: https://backpack.tf/profiles/76561198305494036#!/compare/1565827200/1565913600

Buyer: https://backpack.tf/profiles/76561198128385353#!/compare/1565827200/1565913600

Bot sale, untraceable. Possible mp.tf sale

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Sale #8, Aug 20th:

Seller: https://backpack.tf/profiles/76561198085787109#!/compare/1566172800/1566259200

Buyer: https://backpack.tf/profiles/76561198058252581#!/compare/1566086400/1566259200

Untraceable, possible mp.tf sale

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Sale #9, Jul 22nd:

Buyer: https://backpack.tf/profiles/76561198321019586#!/compare/1563667200/1563753600

Scrap.tf sale, 74 keys. Sold in two days, considering this a quicksale, excluding

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Sale #10, Aug 24th:

Seller: https://backpack.tf/profiles/76561198321019586#!/compare/1566518400/1566604800

Buyer: https://backpack.tf/profiles/76561198013121180#!/compare/1564358400/1566604800

Sold for sunbeams glengarry bonnet, stormy storm otolaryngologist's mirror, holy grail taunt: spent well spirits and spec ks australium sticky launcher.

Sunbeams bonnet resold for vivid bonnet (21, suggestion at 22 but listing at 21) and heart samur-eye (39) = 61

Taunt is ~3.5 keys, quickbuyers at 2.84

Mirror is suggested at 9.5

Taking sticky launcher as 15

= 89

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Sale #11, Jul 8th:

Seller: https://backpack.tf/profiles/76561198001634629#!/compare/1562284800/1562544000

Buyer: https://backpack.tf/profiles/76561198129552058#!/compare/1562457600/1562544000

Cant find which keys were traded

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Sale #12, Jul 14th:

Seller: https://backpack.tf/profiles/76561198129552058#!/compare/1562889600/1563062400

Buyer: https://backpack.tf/profiles/76561198126190606#!/compare/1562803200/1563062400

Quicksell, couldn't be bothered to count exact value

Sale #13, Jul 14th:

https://backpack.tf/profiles/76561198126190606#!/compare/1563062400/1564790400

Some of the keys from sale #11 were then used to buy a morning glory oiled baker boy, ended up with 30 keys and the baker.

???

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Sale #14, Aug 10th:

https://backpack.tf/profiles/76561198009817554#!/compare/1565308800/1565395200

Low or untraceable

Can only find an unusual victory lap, exorcism unu HHHH, double spelled haunted magical mercenary.

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Marketplace.tf sales, https://marketplace.tf/items/tf2/30977;5;u14:

Sale #15, Jul 4th:

190$, keys were 1.84$ = 103 keys

Sale #16, Aug 11th:

95.11$, keys were 1.83$ = 52 keys, quicksell

Sale #17, Aug 17th:

125$, keys were 1.83$ = 69 keys, nice.

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93, 74 (scrap.tf), 89, 69

74 sold in just two days

Taking 89-93

Closing. Too many new sales. Feel free to use anything relevant from this suggestion for a new one.