Item 1

https://backpack.tf/item/3120599589

Sale 1

https://backpack.tf/profiles/76561198085861958#!/compare/1721347200/1721692800

https://backpack.tf/profiles/76561198859721638#!/compare/1721779200/1721865600

775 keys?

Sale 2

https://backpack.tf/profiles/76561198859721638#!/compare/1721952000/1722038400

https://backpack.tf/profiles/76561198097966169#!/compare/1721779200/1722038400

542 keys + Aromatica California Cap + Miami Nights Das Hazmattenhatten + Haunted Ghosts Gauzed Gaze + Scorching Flames Baron von Havenaplane

Mini for the Aromatica California Cap 39 keys

Open sugg on the Miami Nights Das Hazmattenhatten @ 195 keys

Mini for the Haunted Ghosts Gauzed Gaze 212 keys

No sales for the baron, buyers @ ~91 keys (https://imgur.com/a/G9MncTV)

542 + 39 + 195 + 212 + 91 = 1079 keys

Sale 3

https://backpack.tf/profiles/76561198097966169#!/compare/1723852800/1723939200

https://backpack.tf/profiles/76561198258937500#!/compare/1723852800/1723939200

It's A Secret To Everybody Liquidator's Lid + Purple Energy Sergeant's Drill Hat (151.5) + 50 keys

Mini for the It's A Secret To Everybody Liquidator's Lid 860 keys

860 + 151.5 + 50 = ~1062 keys

Sale 4

https://backpack.tf/profiles/76561198258937500#!/compare/1723852800/1723939200

https://backpack.tf/profiles/76561198886850124#!/compare/1723852800/1723939200

No clue

Sale 5

https://backpack.tf/profiles/76561198886850124#!/compare/1725580800/1725667200

https://backpack.tf/profiles/76561198051980490#!/compare/1725494400/1725667200

Added a Serenus Lumen Globetrotter for Collector's Rocket Jumper (470) + Normal Professional Killstreak Batsaber (265) + Collector's Professional Killstreak Big Earner (104) + Collector's Professional Killstreak Diamondback + Collector's Red-Tape Recorder + Collector's Professional Killstreak Conniver's Kunai + Collector's Professional Killstreak L'Etranger + Collector's Dead Ringer + Collector's Professional Killstreak Enforcer + Collector's Cloak and Dagger (55) + Collector's Professional Killstreak Spy-cicle + Collector's Festive Sapper (175) + Collector's Professional Killstreak Ambassador (76) + Collector's Professional Killstreak Your Eternal Reward

No sales for the Globetrotter, buyers @ ~36 keys (https://imgur.com/a/GYU9FbC)

Mini for the Collector's Professional Killstreak Diamondback 90 keys

Mini for the Collector's Red-Tape Recorder 60.5 keys

Mini for the Collector's Professional Killstreak Conniver's Kunai 152.5 keys

Mini for the Collector's Professional Killstreak L'Etranger 88.5 keys

Mini for the Collector's Dead Ringer 100 keys

Mini for the Collector's Professional Killstreak Enforcer 58 keys

Mini for the Collector's Professional Killstreak Spy-cicle 74 keys

Mini for the Collector's Professional Killstreak Your Eternal Reward 115 keys

x + 36 = 470 + 265 + 104 + 90 + 60.5 + 152.5 + 88.5 + 100 + 58 + 55 + 74 + 175 + 76 + 115

x = ~1848 keys...

Sale 6

https://backpack.tf/profiles/76561198051980490#!/compare/1726012800/1726099200

https://backpack.tf/profiles/76561198244962432#!/compare/1726012800/1726099200

Added Frostbite Grimm Hatte + 36 keys for Darkblaze Glasgow Great Helm + Convulsive Fiery Taunt: Kazotsky Kick

This is the only sale for the Glasgow, so best used there

Total Sales

775, 1062, 1079, 1848

https://imgur.com/a/botkyfm

Well, 1848 is clearly high here

Rounding and taking 780 - 1080 keys c: