Credits to Shuffle Spy for the help.

Sale 1) Sold for a Duped Disco Beat Down Exquisite Rack

https://backpack.tf/profiles/76561198105071091#!/compare/1586995200/1587081600

Excluding because...

https://backpack.tf/profiles/76561198063837280#!/compare/1586995200/1587081600 - Iffy sells the duped dbd rack for the snowfallen peak

https://backpack.tf/profiles/76561198063837280#!/compare/1587081600/1587168000 - Iffy adds a bunch to the peak for a darkblaze honcho

https://backpack.tf/profiles/76561198232041512#!/compare/1589587200/1589673600 - Iffy adds some to the honcho to get the rack back

So it's a money dump/regret sale for the Rack and not great to use.

Sale 2) Bulk sale for a Darkblaze Honcho's Headgear

https://backpack.tf/profiles/76561198063837280#!/compare/1587081600/1587168000

Sale 3) Sold for a Burning Charmer's (182.5 Keys) + Kill-a-Watt Coldfront (24 Keys) + Cloud 9 Nuke (21 Keys)

https://backpack.tf/profiles/76561198171447086#!/compare/1587772800/1587859200

182.5 + 24 + 21 = 227.5, which I'll round up to 230 Keys

Coldfront Mini

https://imgur.com/a/72AW7Qt - 10 day seller, was previously 26 for about a month and a half

No other usable sales

Nuke Mini

https://imgur.com/a/yiaHVQW - 3 day seller at 21 Keys

No other usable sales

Sale 4) Sold for a Scorching Flames War Pig

https://backpack.tf/profiles/76561198063640894#!/compare/1587772800/1587859200

https://backpack.tf/profiles/76561198036785222#!/compare/1587772800/1587859200

Sale 5) Sold + Spec KS Aussie Stickybomb (~17 Keys) for a CPS Co-Pilot (180 Keys) + PE Classy Capper (67.5 Keys)

https://backpack.tf/profiles/76561198036785222#!/compare/1587772800/1587859200

https://backpack.tf/profiles/76561198057452720#!/compare/1587772800/1587859200

180 + 67.5 - 17 = 230.5, which rounds to 230 Keys

Co-Pilot Mini

https://backpack.tf/suggestion/5f06d934ad5aac1c6251bcfb - 180 Keys

Classy Mini

https://backpack.tf/suggestion/5f06eb166f9d32700e566494 - 67.5 Keys

Sale 6) Sold for a Stormy 13th Anger + HG Yellow + 70 Keys + Strange Original (~23 Keys) + Earbuds (~3 Keys)

https://backpack.tf/profiles/76561198057452720#!/compare/1588204800/1588291200

High outlier.

Anger Mini

https://backpack.tf/profiles/76561198118157202#!/compare/1586822400/1586908800 - The Flamenco has buyers at 89 Keys

https://backpack.tf/profiles/76561198196606339#!/compare/1592870400/1593129600 - Duped sold for a 13th Ushanka + ~70 Keys of Items

https://backpack.tf/profiles/76561198083134207#!/compare/1592265600/1592352000 - Ushanka sold for a Harvest Panama + Pro Aussie Spelled Rocket

Sale 7) Sold for $650 when Keys were $1.98 each

https://marketplace.tf/items/tf2/30743;5;u143

650 / 1.98 = 328.28, which can be rounded to 330 Keys