Sale 1:

https://backpack.tf/profiles/76561198021272428#!/compare/1546819200/1546905600

https://backpack.tf/profiles/76561198059566837#!/compare/1546905600/1546992000

Sold for 240 keys pure.

Sale 2:

https://backpack.tf/profiles/76561198869656655#!/compare/1547337600/1547769600

???

Sale 3: (Credits Shuffle)

Sold for a Duped Burning Flames Troublemaker's Tosslecap (110 Keys) + ~98 Keys of Australiums and a Vintage Pro KS Luger

https://backpack.tf/profiles/76561198061440669#!/compare/1540425600/1540512000

110 + 98 = 208, which rounds to 210 Keys

Duped Burning Flames Troublemaker's Tosslecap Mini

https://backpack.tf/profiles/76561198179707937#!/compare/1541116800/1541289600 - Sold for a Disco Beat Down Hong Kong Cone

https://backpack.tf/profiles/76561198100050147#!/compare/1543968000/1544054400 - Bulk sale for a Cloudy Moon Patriot Peak

https://backpack.tf/profiles/76561198328624791#!/compare/1543881600/1544054400 - Bulk sale for a Harvest Moon Pyromancer's Mask

https://backpack.tf/profiles/76561198054862332#!/compare/1544400000/1544572800 - Bulk sale for a Harvest Moon Team Captain

https://backpack.tf/profiles/76561198232041512#!/compare/1545436800/1545523200 - Sold for 110 Keys

https://imgur.com/a/IiCT9hp - Supreme confirming his purchase, since the above compare link shows 109 Keys.

https://backpack.tf/profiles/76561198099481645#!/compare/1540857600/1541203200 - Sold + ~20 Keys of Items for a Sunbeams Ballcap

https://backpack.tf/profiles/76561198113188320#!/compare/1541116800/1541203200 - Bulk sale

https://backpack.tf/profiles/76561198061779536#!/compare/1541289600/1541376000 - Sold for a Burning Flames Field Practice + 7 Keys

Using the Ballcap sale for the Ballcap and the Field Practice sale for the Field Practice. The HKC sale is high.

Sale 4: Credits Shuffle)

https://backpack.tf/profiles/76561198021272428#!/compare/1544400000/1544486400 - Seller's Backpack

https://backpack.tf/profiles/76561198210322871#!/compare/1544400000/1544486400 - Buyer's Backpack

Sold with 41 keys worth of items for a GE Veil

https://backpack.tf/suggestion/5c2a6d4f44325a593c18e5cc - Being used here.

210 - 240