Wow.

Sold for 27 keys + 13 refined

https://backpack.tf/profiles/76561198401236682#!/compare/1589760000/1590019200

https://backpack.tf/profiles/76561198209640976#!/compare/1589673600/1589760000

Rounds to 27 keys

Sold for Hot Butcher Bird Grenade Launcher (Well-Worn)

https://backpack.tf/profiles/76561198063919103#!/compare/1590883200/1590969600

https://backpack.tf/profiles/76561198002757046#!/compare/1590969600/1590883200

Sold for 34 keys

https://backpack.tf/profiles/76561198148511293#!/compare/1590624000/1590710400

https://backpack.tf/profiles/76561198063919103#!/compare/1590624000/1590710400

Unknown

https://backpack.tf/profiles/76561198093437542#!/compare/1589068800/1589241600

https://backpack.tf/profiles/76561198148511293#!/compare/1588982400/1589068800

Unknown

https://backpack.tf/profiles/76561198337734785#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198093437542#!/compare/1588204800/1588464000

Bulk

https://backpack.tf/profiles/76561198254882979#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198118157202#!/compare/1585094400/1585180800

Bulk

https://backpack.tf/profiles/76561198147857818#!/compare/1584921600/1585008000

https://backpack.tf/profiles/76561198254882979#!/compare/1584921600/1585008000

Sold for 59.99 on March 21, 2020

59.99/1.68 = 35.7 rounding to 36 keys

https://marketplace.tf/items/tf2/30072;5;u89

https://backpack.tf/item/3277924997

Sold for 62.22 on April 17, 2020

62.22/1.77 = 35.15 rounding to 35 keys

https://marketplace.tf/items/tf2/30072;5;u89

https://backpack.tf/item/3435601460

Classifieds:

https://gyazo.com/d062a9d968f89f93888fe2988fa30bfb

Sales are at 27, 34, 35, and 36. Buyer at 31+. Excluding 27. Seller at 33 and 35. 33 is only 3 hours old, while 35 has been there for 10 days. However, all 3 sales are very close together, not excluding.

Taking a range of 34-36 keys here.