No formatting because i'm lazy and copy pasted (part of) this

Hellish Inferno Spent Well Spirits

Sellers: http://prntscr.com/f5utuv

6 days @ 21, 5 days @22, 9 days @22, 1 month @25

Sale 1:

http://backpack.tf/profiles/76561198142677018#!/compare/1490572800/1490659200

Sold with 0.6 keys of sweets for Strange Professional Killstreak Gunslinger (19) = 18.4 Keys -> 18 Keys

http://www.tf2outpost.com/trade/28816593 - b/o 25

Sale 2:

http://backpack.tf/profiles/76561198114071366#!/compare/1490572800/1490659200

Sold with 5 Keys in sweets for Green Confetti Fancy Fedora (23) = 18 Keys

no outpost

Mini for Fedora:

http://backpack.tf/profiles/76561198108148076#!/compare/1489104000/1489276800

Sold for 23 Keys = 23

Sale 3:

http://backpack.tf/profiles/76561198058005831#!/compare/1490832000/1490918400

Sold for Blizzardy Storm Lucky Shot (18.5) = 18.5 rounding to 19 Keys

Sale 4:

http://backpack.tf/profiles/76561198174470406#!/compare/1491264000/1491696000

Sold for Midnight Whirlwind Taunt: Oblooterated (22) = 22 Keys

Month seller at 22, capping at that. http://prntscr.com/f27rvf

Sale 5:

http://backpack.tf/profiles/76561198174470406#!/compare/1491091200/1491177600

Sold with Duped Disco Beat Down Firewall Helmet (23.5) for Duped Disco Beat Down Towering Pillar of Hats (54) + 2 Keys = 32.

Mini for Towering Pillar

http://backpack.tf/profiles/76561197993989727#!/compare/1490572800/1490659200

Sold for Disco Beat Down Company Man (40.5) + 13 Keys = 53.5 Rounding to 54 Keys

Sales at 18, 18, 19, 22, 32.

Taking range as 18-19. Because Mindacos said so :p

http://backpack.tf/suggestion/59050f5ae338776cd7523b84#comment-591176c9e3387745fb645eb6