All creds to this good lad: https://backpack.tf/suggestion/5b8ad5bd44325a707510d501

Sunbeams Airdog

Sale 1

Bulk

https://backpack.tf/profiles/76561198299093168#!/compare/1533081600/1533168000

https://backpack.tf/profiles/76561198192602363#!/compare/1533081600/1533168000

Sale 2

Sold for 35 keys

https://backpack.tf/profiles/76561198192602363#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198067771702#!/compare/1463961600/1533686400

Buyers side first entry since 2016

Sale 3

Sold with 5 keys ~0.5 keys in items for a Scorching Flames Respectless Rubber-Glove (use there)

https://backpack.tf/profiles/76561198067771702#!/compare/1533772800/1533859200

Buyers side traded too quickly

Sale 4

Sold for 29 keys

https://backpack.tf/profiles/76561198516017657#!/compare/1533772800/1533859200

Seller's side not tracked.

Sale 5

Sold for 30 keys

https://backpack.tf/profiles/76561198516017657#!/compare/1533945600/1534118400

https://backpack.tf/profiles/76561198732228048#!/compare/1534032000/1534118400

Sale 6

Sold for 29 keys

https://backpack.tf/profiles/76561198127437679#!/compare/1533340800/1533427200

https://backpack.tf/profiles/76561198114312016#!/compare/1533340800/1533427200

Sale 7

Sold for 29 keys

https://backpack.tf/profiles/76561198356608082#!/compare/1534118400/1534550400

https://backpack.tf/profiles/76561198152236177#!/compare/1534464000/1534550400

Buyers side quicksold their Burning Flames Magnificent Mongolian and then used the keys for the Airdog

Sale 8

Sold for 31 keys

https://backpack.tf/profiles/76561198209640976#!/compare/1535068800/1535155200

https://backpack.tf/profiles/76561198062197943#!/compare/1534982400/1535155200

Sale 9

Sold with 11 keys in adds for a Miami Nights Tough Stuff Muffs (51.5 keys) = 40.5 keys = 41 keys

https://backpack.tf/profiles/76561198062197943#!/compare/1535155200/1535241600

https://backpack.tf/profiles/76561198094281531#!/compare/1535241600/1535328000

Sale 10

Sold for 30 keys

https://backpack.tf/profiles/76561198094281531#!/compare/1535328000/1535414400

https://backpack.tf/profiles/76561198054198170#!/compare/1535241600/1535414400

Sale 11

Bulk for a Cloud 9 Bonk Boy (used there)

https://backpack.tf/profiles/76561198054198170#!/compare/1535414400/1535500800

https://backpack.tf/profiles/76561198132561543#!/compare/1535328000/1535500800

Sale 12

Bulk for Sunbeams Noir (use there)

https://backpack.tf/profiles/76561198132561543#!/compare/1535500800/1535587200

https://backpack.tf/profiles/76561198060113354#!/compare/1535500800/1535587200

Sale 13

Sold for a Fountain of Delight Buy A Life (5.25 keys) + 26 keys = 31 keys

https://backpack.tf/profiles/76561198346129973#!/compare/1534032000/1534118400

https://backpack.tf/profiles/76561198836867687#!/compare/1534032000/1534118400

Sale 14

Sold with 9 keys in Mixed for a SBTWC Nanobalaclava (40.5 keys) = 32 keys

https://backpack.tf/profiles/76561198836867687#!/compare/1534118400/1534204800

https://backpack.tf/profiles/76561198112516663#!/compare/1534032000/1534204800

Sale 15

Bulk

https://backpack.tf/profiles/76561198112516663#!/compare/1534032000/1534204800

https://backpack.tf/profiles/76561198218497692#!/compare/1534118400/1534204800

Sale 16

Sold for a Terror-Watt Tipped Lid (26 keys) + ~4 keys in adds = 30 keys

https://backpack.tf/profiles/76561198218497692#!/compare/1534204800/1534377600

https://backpack.tf/profiles/76561198275742101#!/compare/1534377600/1534636800

Mini for the Tipped Lid

Sold for 26 keys

https://backpack.tf/profiles/76561198002757046#!/compare/1532217600/1532304000

https://backpack.tf/profiles/76561198158206236#!/compare/1532217600/1532304000

Sale 17

https://marketplace.tf/items/30767;5;u17

http://manic.tf/keyprice/?at=2018-08-18

Sold for $50.5 / $1.89 = 26.72 keys = 27 keys

Sale 18

28 keys

https://backpack.tf/profiles/76561198192602363#!/compare/1535760000/1535846400

https://backpack.tf/profiles/76561198063551266#!/compare/1535673600/1535846400

Sale 19 (Outlier either way)

9 keys, blizz handle (8.5) and insomnia airdog (outdated)

https://backpack.tf/profiles/76561198382654640#!/compare/1536883200/1536969600

https://backpack.tf/profiles/76561198809836021#!/compare/1536796800/1536969600

https://i.imgur.com/TzZSdVO.png - b/o of 34

Sold for 27 keys Plus a conga (28)

https://backpack.tf/profiles/76561198130744764#!/compare/1534723200/1534896000

Oh boy free suggestion.