Hot and Steamy

https://backpack.tf/item/6838871359

Sale 1) Sold for 19 Keys + ~1 Key of Items

https://backpack.tf/profiles/76561198202085200#!/compare/1539216000/1540425600

19 + 1 = 20 Keys

Sale 2) Sold + ~8 Keys of Items for 35 Keys

https://backpack.tf/profiles/76561198352969437#!/compare/1540166400/1540339200

35 - 8 = 27 Keys

Sale 3) ?

https://backpack.tf/profiles/76561198430767896#!/compare/1540339200/1540512000

https://backpack.tf/item/7255132723

Sale 4) ?

https://backpack.tf/profiles/76561198183297649#!/compare/1542153600/1542585600

Sale 5) Sold for 17 Keys + 7 Refined

https://backpack.tf/profiles/76561198028021876#!/compare/1542585600/1542758400

Low outlier.

https://backpack.tf/item/1118061334

Sale 6) Sold for a Stormy Storm Reggaelator (14 Keys) + ~3 Keys of Items

https://backpack.tf/profiles/76561198051888880#!/compare/1539388800/1539475200

Low outlier.

Reggae Mini

https://imgur.com/a/VuNw82I - 2 Week Seller at 14 Keys

https://backpack.tf/item/1716048333

https://marketplace.tf/items/390;5;u29 - Sold for $34.17 (~20 Keys)

Taking 14 Keys.

Sale 7) Sold + ~3 Keys of Items for a Purple Confetti Towering Pillar of Hats

https://backpack.tf/profiles/76561198051888880#!/compare/1539561600/1539648000

Not a good sale to use for either.

Pillar Mini

https://imgur.com/a/8dNjDDL - 2 Week Seller at 19 Keys

https://backpack.tf/profiles/76561198167637295#!/compare/1544659200/1544745600 - Sold for 18 Keys

https://backpack.tf/profiles/76561198031476026#!/compare/1544659200/1544745600 - Sold for a Terror-Watt Front Runner (20.5 Keys)

Front Runner Micro

https://backpack.tf/profiles/76561198407541175#!/compare/1544572800/1544659200 - Sold for 19 Keys

https://backpack.tf/profiles/76561198137566942#!/compare/1543795200/1543881600 - Sold for 18 Keys + 9 Refined

https://backpack.tf/profiles/76561198002757046#!/compare/1545523200/1545609600 - Sold for 20 Keys

https://backpack.tf/profiles/76561198205307372#!/compare/1545955200/1546041600 - Sold for 22 Keys + 23 Refined

Sale 8) Quicksold for 17 Keys

https://backpack.tf/profiles/76561198002391950#!/compare/1539561600/1539648000

Sale 9) ?

https://backpack.tf/profiles/76561198266876790#!/compare/1539734400/1539820800

https://backpack.tf/profiles/76561198037248506#!/compare/1539734400/1539820800

Sale 10) ?

https://backpack.tf/profiles/76561198037248506#!/compare/1539993600/1540080000

Sale 11) ?

https://backpack.tf/profiles/76561198863934498#!/compare/1545264000/1545350400

https://marketplace.tf/items/611;5;u36 - Sold for $49.99 when Keys were ~$1.72 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

49.99 / 1.72 = 29.06, which rounds to 29 Keys

Calling 29 high because of all of the lower sales.