Countering.

https://backpack.tf/item/7855003044

Sale 1) SCM sale

https://backpack.tf/profiles/76561198154533326#!/compare/1560902400/1561248000

https://backpack.tf/profiles/76561198212668879#!/compare/1561507200/1561680000

https://backpack.tf/item/7541978438

Sale 2) ?

https://backpack.tf/profiles/76561198344023079#!/compare/1563840000/1563926400

https://backpack.tf/profiles/76561198010993339#!/compare/1563840000/1563926400

https://backpack.tf/item/6960464216

Sale 3) Sold for a Duped Stormy 13th Hour Ye Olde Baker Boy (~118 Keys) + 13 Keys + ~4.5 Keys of Items

https://backpack.tf/profiles/76561198264117106#!/compare/1559692800/1559779200

Fits in the range. Supports the high end.

Baker Mini

https://backpack.tf/profiles/76561198119149660#!/compare/1557187200/1557446400 - Sold for a Sunbeams Troublemaker's Tossle Cap

https://backpack.tf/profiles/76561198166314775#!/compare/1559174400/1559260800 - Sold for a Warp Buckaroo (36.5 Keys) + C9 Sensei + BS Charmer's + 11 Keys

https://backpack.tf/profiles/76561198303886984#!/compare/1559520000/1559606400 - Sold for a CV Bone Dome + 55 Keys

https://backpack.tf/profiles/76561198264117106#!/compare/1560211200/1560297600 - Sold + 25 Keys for a Strange SF Boxcar Bomber

https://backpack.tf/profiles/76561198883188648#!/compare/1560297600/1560384000 - ?

https://marketplace.tf/items/tf2/107;5;u47 - Sold for $249.99 when Keys were ~$1.84 each (~136 Keys)

The Buckaroos/Sensei/Chapeau sale is around 100 Keys, so the Baker is ~100 - 136 Keys

Sale 4) Sold for a Head of Steam Defragmenting Hard Hat 17% + Purple Energy Universal Translator

https://backpack.tf/profiles/76561198102318448#!/compare/1561075200/1561161600

Excluding this sale as the Hard Hat has no Mini.

https://backpack.tf/item/5869308046

Sale 5) Sold for 128 Keys + Dead Presidents Sultan's Ceremonial (9.5 Keys)

https://backpack.tf/profiles/76561198114402400#!/compare/1564704000/1564790400

128 + 9.5 = 137.5, which I'll round to 140 Keys

Sultan's Mini

https://backpack.tf/suggestion/5d475147d3817205e93a9b46 - 9.5 Keys

https://mannco.store/item/12149 - Sold for $190 when Keys were ~$1.76 each

https://mannco.store/item/1

190 / 1.76 = 107.95, which rounds to 108 Keys

https://imgur.com/a/i7P5hRM - Seller at $200 (~110 Keys, Key prices vary) for 3 weeks

https://backpack.tf/item/7838698252