I'll be honest, finding all this was not easy.

https://backpack.tf/profiles/76561199045633757#!/compare/1591142400/1591747200

https://backpack.tf/profiles/76561198171471223#!/compare/1591488000/1591660800

sold for Cyclone Zoomin

likely to end up low?

https://backpack.tf/profiles/76561198171471223#!/compare/1592265600/1592438400

https://backpack.tf/profiles/76561198112826532#!/compare/1592352000/1592438400

Sold with 12 keys for Beams Airdog

Bulk

https://backpack.tf/profiles/76561198112826532#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198282873040#!/compare/1592352000/1592438400

Sold for keys, probably check Blizzardy Airdog and G Fetti Falirk for keys from Anthuan or Tryhard.

https://backpack.tf/profiles/76561198282873040#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198381243318#!/compare/1592352000/1592438400

Sold for 13 keys from raxes

https://backpack.tf/profiles/76561198381243318#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198317571803#!/compare/1592179200/1592438400

Sold for Steaming Pillar

https://backpack.tf/profiles/76561198317571803#!/compare/1592179200/1592438400

https://backpack.tf/profiles/76561198107676964#!/compare/1592352000/1592438400

Sold with ~4 keys in sweets for C9 Scotsman(16) + negligible sweets

https://backpack.tf/item/7957390099

Scotsman sold for C9 Impaler.

Total is 12 keys

https://backpack.tf/profiles/76561198107676964#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198050726553#!/compare/1592352000/1592438400

Sold with ~4 keys in sweets for Aussie Amby(14 at time of sale --> https://bot.tf/stats/listings/4WX3DD27 )

Amby was bought for keys before begin used to buy the Milkman

Total is 10 keys

https://backpack.tf/profiles/76561198050726553#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198069800323#!/compare/1592352000/1592438400

Sold with ~4 keys in sweets (taking key price of the time of sale) for Spelled Bills hat

the 3 keys at the very end + RL + Guillotine stuck with the hat for all the sales.

Bills hat will need a mini, and you can decide for yourself if the Steaming Pillar does as well.