Sale 1:

Sold with a ~1 key in sweets for Green Confetti Airdog (16), 15 keys total

https://backpack.tf/profiles/76561198142438504#!/compare/1501804800/1501891200

https://backpack.tf/profiles/76561198301192601#!/compare/1501804800/1501891200

Airdog:

~15.5

https://backpack.tf/suggestion/5a034884cf6c756bae377a74

Sale 2:

Sold for Orbiting Planets Brain Bucket (10)

https://backpack.tf/profiles/76561198301192601#!/compare/1501718400/1501804800

Bucket:

sellers for ~10 and buyers for ~9, i guess 10 will work

https://imgur.com/a/LWRGx

Sale 3:

Only 8 keys here matchs

https://backpack.tf/profiles/76561198207603105#!/compare/1505260800/1505347200

Sale 4:

obv high outlier

https://backpack.tf/profiles/76561198034268412#!/compare/1505692800/1505779200

Sale 5:

Scm

https://backpack.tf/profiles/76561198060730470#!/compare/1497830400/1498003200

Sale 6:

Sold for Infernal Smoke Taunt: Battin' a Thousand (15) + Skill Gotten Gains Taunt: Deep Fried Desire (13), 28 keys total

https://backpack.tf/profiles/76561198061690694#!/compare/1506902400/1506988800

Gain taunt:

13 keys pure

https://backpack.tf/profiles/76561198083137273#!/compare/1506384000/1506470400

Sale 7:

sold for Isotope Specialized Killstreak Blitzkrieg Knife (Minimal Wear) (29) + ~3 keys in sweets, 32 total

https://backpack.tf/profiles/76561198083137273#!/compare/1506988800/1507075200

Knife:

29 keys pure (only 29 matches here)

https://backpack.tf/profiles/76561198078578085#!/compare/1506902400/1506988800

Sale 8:

Sold for Searing Plasma Dead Cone (20) + ~1 key in sweets, 21 keys total

https://backpack.tf/profiles/76561198034268412#!/compare/1506816000/1506902400

Cone:

https://backpack.tf/suggestion/5a021e9644325a27836c6a82

Sale 9:

scm

https://backpack.tf/profiles/76561198166767479#!/compare/1506816000/1506902400

Sale 10:

easy b/o cap https://imgur.com/a/L4Mcd , 20 keys total

https://backpack.tf/profiles/76561198053549889#!/compare/1509926400/1510012800

Sale 11:

Sold for Smoking Capo's Capper (12)

https://backpack.tf/profiles/76561198359449894#!/compare/1509062400/1509235200

Sales at 8,10,12,21

8,10,12,15,20,21,28,32,100(?)

some mature sellers for 20-21 keys: https://imgur.com/a/xGN0d

rolling with 15-21 keys range

thanks JoXu and Mindacos for help!

https://backpack.tf/suggestion/59d4fc26cf6c750b943cb578

https://backpack.tf/suggestion/5a01f69444325a1bb957617c