Sale 1:

Sold for Green Energy Janissary Ketche (Suggestion at 23)+ a ~2 key taunt

No outpost

Seller: https://backpack.tf/profiles/76561198160856661#!/compare/1509494400/1509580800

Buyer: https://backpack.tf/profiles/76561198255640609#!/compare/1509062400/1509580800

X = 25

Sale 2:

Sold for ~17 keys in pure/metal in ~3 days

No outpost

Seller: https://backpack.tf/profiles/76561198337734785#!/compare/1505779200/1505865600

Buyer: https://backpack.tf/profiles/76561198346271715#!/compare/1505692800/1505865600

X = 17

Sale 3:

Sold for 17 keys

Seller: https://backpack.tf/profiles/76561198346271715#!/compare/1506124800/1506556800

Buyer: https://backpack.tf/profiles/76561198039531742#!/compare/1505865600/1506556800

X = 17

Sale 4:

Sold for Vivid Plasma Big Elfin Deal

Seller: https://backpack.tf/profiles/76561198255640609#!/compare/1509580800/1509667200

Buyer: https://backpack.tf/profiles/76561198192602363#!/compare/1509580800/1509667200

No mini available. Can be used on the Elf.

Sale 5:

Bulk for Burning Flamboyant

Seller: https://backpack.tf/profiles/76561197962488873#!/compare/1505433600/1505606400

Buyer: https://backpack.tf/profiles/76561198104979324#!/compare/1505520000/1505606400

Sale 6:

Sold with ~16 keys in items for Smoking Salty Dog

Seller: https://backpack.tf/profiles/76561198161322716#!/compare/1508889600/1509494400

Buyer: https://backpack.tf/profiles/76561198160856661#!/compare/1509408000/1509494400

Should be used on the Salt.

Green Energy Ketche:

https://backpack.tf/suggestion/5a0a7e6ecf6c7554dc4a7812

Sellers:

24 keys:

https://i.imgur.com/xkfiRUs.png - 5 months

https://i.imgur.com/if1caGL.png - 11 days

Sales at:

17 (2x)

25

5-month old seller at 24 shows that it cannot sell for 24 or more. Excluding 25.

Going with 17 flat.