Creds K1ng and the original suggester.

Sale #1

Sold for 14 keys + Taunt: The Schadenfreude.

https://backpack.tf/profiles/76561198032016356#!/compare/1515801600/1515888000

Taking 15k

Sale #2

Sold for 16 keys.

https://backpack.tf/profiles/76561198259128870#!/compare/1515456000/1515888000

Taking 16k

Sale #3

Sold for 22 keys. {High}

https://backpack.tf/profiles/76561198060651213#!/compare/1513641600/1513728000

{Excluding}

Sale #4

Sold for an Abduction Universal Translator along with ~4 keys in sweets. {High}

https://backpack.tf/profiles/76561198114001918#!/compare/1515024000/1515110400

{Excluding}

Sale #5

Sold for ~14 keys in sweets.

https://backpack.tf/profiles/76561198090614429#!/compare/1521244800/1521504000

Taking 14k

Recent marketplace sale at ~17 keys.

https://marketplace.tf/items/1183;5;u3005

Current Sellers.

https://imgur.com/a/kZNAu ----- Sellers at 15 (young), 19 (young), ~21 (26 days and 4 days).

Final Price: 14k-17k