Full credits to Man Mail, I only helped a bit and he asked me to resuggest for him.

Sale 1:

Sold for a secret to everybody prehistoric pullover(635), omnicent orb defragmenting hard hat 17%(62.5) scorching flames frontier djustice, spooky night victory lap, purple confetti gauzed gaze, professional killstreak medigun kit(22), 26 keys and a strange courtier's collar

https://backpack.tf/profiles/76561198418740133#!/compare/1560816000/1560902400

https://backpack.tf/profiles/76561198134512931#!/compare/1560816000/1560902400

Mini for Purple Confetti gauzed gaze (33 Keys)

https://backpack.tf/profiles/76561198418740133#!/compare/1566777600/1566950400

https://backpack.tf/profiles/76561198062779400#!/compare/1566777600/1566950400

Sold for a haunted ghosts carribean conqueror and a dead presidents virus doctor:

Micro for carribean conqueror:

https://marketplace.tf/items/tf2/30116;5;u8 // https://backpack.tf/item/5280729748 not 100 % on history

Sold for 30$ on August 12th

keys were 1.82$

$30 / $1.82 = 16.48 keys

Micro for dead presidents virus doctor:

https://marketplace.tf/items/tf2/30043;5;u60 // https://backpack.tf/item/1784374172 not 100 % on history

sold for 29.99 on july 25

keys were 1.81$

$29.99 / $1.81 = 16.57 keys

---------

Mini for Spooky Night Victory Lap (32 Keys)

https://marketplace.tf/items/tf2/1172;5;u3021

Sale 1:

Sold for 59.95$ on August 15

Keys were 1.83$ on that day

$59.95 / $1.83 = 32.76 keys

Rounding to 33 keys

Sale 2:

Sold for 62.99$ on July 21st

Keys were 1.81$

$62.99 / $1.81 = 34.80 keys

Rounding to 35 keys

Sale 3:

Sold for 37.11$ on August 15

Keys were 1.83$ on that day

$37.11 / $1.83 = 20.28 keys

Rounding to 20 Keys

Sale 4:

Sold for 70$ on September 8

Keys were 1.82$ on that day

$70 / $1.82 = 38.46 keys

Rounding to 38 Keys

Sale 5:

Sold for 56$ on September 8

Keys were 1.82$ on that day

$56 / $1.82 = 30.77 keys

Rounding to 31 Keys

Month seller at 34 Keys http://prntscr.com/p5s37o

Using last month is more accurate

Sales at 20/31/33/38

Removing the sale at 20 since it's below buyer, 38 is also too high compared to current market.

Mini for Scorching Flames Frontier Djustice:

https://backpack.tf/profiles/76561198125247757#!/compare/1562544000/1562630400

https://backpack.tf/profiles/76561198210673328#!/compare/1562630400/1562716800

Sold with 20 keys for a death at dusk brotherhood of arms

Mini for death at dusk brotherhood of arms (135 Keys)

Using https://backpack.tf/item/3351354099

https://backpack.tf/profiles/76561198210673328#!/compare/1564790400/1565136000

https://backpack.tf/profiles/76561198114402400#!/compare/1564790400/1565136000

Sold with 2 professional killstreak beggar's bazookas for a Hat of Undeniable Wealth and Respect

HOUWAR Micro

https://backpack.tf/profiles/76561198005574075#!/compare/1563494400/1563580800 - Sold for 150 Keys

https://backpack.tf/profiles/76561198227991072#!/compare/1561161600/1561248000 - Sold for 132 Keys to a buy order

https://backpack.tf/profiles/76561198014709984#!/compare/1564444800/1564617600 - Sold for 131 Keys + Spec KS Aussie Mini (~19 Keys) + Taunts

https://backpack.tf/profiles/76561198065733542#!/compare/1564531200/1564617600 - Dragonborn first sold for 129 Keys out of the 131 above

https://imgur.com/a/fcqWFAO - Capped by the Buyout of 160 Keys

https://backpack.tf/profiles/76561197994697258#!/compare/1560211200/1560297600 - Sold for a GBH Company + Demonflame Festivizer + EOF Gonzila

https://imgur.com/a/6oSMxlC - Capped by the Buyout of 160 Keys

https://marketplace.tf/items/tf2/334;6 - Sales range from 156 Keys (7/1) to 163 Keys (8/10). $269.99 is 142 Keys and below Buyers

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

Taking 150 - 163, which averages to 156.5 Keys.

Sale is 156.5-4 keys=152.5 keys

Rounding to 155 keys

Rounding to 950 keys

Sale 2:

https://backpack.tf/profiles/76561198134512931#!/compare/1560902400/1560988800

https://backpack.tf/profiles/76561198157176919#!/compare/1560816000/1560988800

tradeback, not including

Sale 3:

Sold for a green black hole galvanized gibus, it's a secret to everybody modest pile of hat, stare from beyond patriot's peak (indate at 180 Keys), frostbite towering titanium pillar of hats + 114 keys and some sweets

https://backpack.tf/profiles/76561198129995083#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198134512931#!/compare/1561680000/1561766400

Green Black Hole Galvanized Gibus - 420 Keys

https://backpack.tf/suggestion/5d791c1267807243311873fe

It's A Secret To Everybody Modest Pile of Hat - 375 Keys

https://backpack.tf/suggestion/5d5fc5686780727b9b11f420

Isotope Killstreak Totally Boned Scattergun (Field-Tested) - 30 Keys

https://marketplace.tf/items/tf2/200;15;u702;w3;pk240;kt-1 // https://backpack.tf/item/7283127632

$54 / $1.83 = 29.51 keys

B/O was 1000 Keys https://bot.tf/stats/listings/4R786094

Sale 4:

Sold for a bonzo hunter in darkness, circling tf logo villain's veil(113) and a spectral swirl zoomin' broom (35) + 260 Keys

https://imgur.com/a/0PFWBFh ( keys do not show up in the compare links)

https://backpack.tf/profiles/76561198129995083#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198027063074#!/compare/1566691200/1566777600

Mini for bonzo hunter in darkness(570 Keys)

https://backpack.tf/suggestion/5d75303e6780720bea540baa

https://bot.tf/stats/listings/MXQE3WN1 buyout at 2000, no need to cap

Sale 5:

Sold with 80 keys for Stormy 13th Hour Exquisite Rack - Use there

https://backpack.tf/profiles/76561198027063074#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198306288794#!/compare/1567123200/1567209600

Sales at 950/1000/1000