Credit to Rainy for the help.

https://backpack.tf/item/3706130136

https://backpack.tf/profiles/76561198415564349#!/compare/1696636800/1696982400

1350 Keys

https://backpack.tf/profiles/76561198109140236#!/compare/1693612800/1693872000

https://backpack.tf/item/1981347571

https://backpack.tf/profiles/76561198109140236#!/compare/1697500800/1697587200

Looks like a KaW VVF (recently priced at 740 keys), Double Spelled Arcana Robo Glove(Nonspelled recently priced at 300 keys), Sunbeams Mad Doctor (using buy orders at 138 keys), and Pumpkin Moon Wandering Wraith(Barely outdated at 392.5 keys, but in date at the time it was traded; using 392.5 keys), 30 keys, 3 ref and giftapult.

Mini for Sunbeams Mad Doctor

https://backpack.tf/item/7053729230

https://backpack.tf/profiles/76561198081042493#!/compare/1691625600/1691712000

131 Keys

https://backpack.tf/item/10780527421

https://backpack.tf/profiles/76561198175279315#!/compare/1699056000/1699142400

Burly Beast(44.5 keys), Purple energy elf care provider (20 keys) 7 keys, and 2 keys in sweets. - ~70 keys

Buy orders are currently at 138 keys so I'll just use buy orders

https://backpack.tf/stats/Unusual/Das%20Maddendoktor/Tradable/Craftable/17 - 138 keys

740 + 300 + 138 + 392.5 + 30 = 1600 keys

Going with a range of 1350 - 1600 keys