Sale 1: 45

https://manic.tf/keyprice/?at=2018-10-27&price=82.47

44.82 keys, rounding to 45

Sale 2: 53

https://manic.tf/keyprice/?at=2018-11-15&price=92.78

53.32 keys, rounding to 53

Sale 3: 43

https://manic.tf/keyprice/?at=2018-12-14&price=70

42.68 keys, rounding to 43.

Sale 4: 41

https://backpack.tf/profiles/76561198067557593#!/compare/1545091200/1545177600

https://backpack.tf/profiles/76561198083000445#!/compare/1544572800/1545177600

Sold for 41 pure.

Sale 5: 27

https://backpack.tf/profiles/76561198083000445#!/compare/1545264000/1545350400

https://backpack.tf/profiles/76561198132113819#!/compare/1545264000/1545350400

Sold with 11 keys and cow mangler kit for isotope turbine torcher(38)

Sale 6: N/A

https://backpack.tf/profiles/76561198157928445#!/compare/1542412800/1542672000

https://backpack.tf/profiles/76561198057671085#!/compare/1542412800/1542672000

Sold for 50 pure?

Sale 7: 57

https://backpack.tf/profiles/76561198057671085#!/compare/1543104000/1543190400

https://backpack.tf/profiles/76561198083637067#!/compare/1543190400/1543449600

https://imgur.com/a/IFtzNGE

Sold for 57 pure.

Sale 8: N/A

https://backpack.tf/profiles/76561198083637067#!/compare/1544918400/1545782400

https://backpack.tf/profiles/76561198084126218#!/compare/1545696000/1545782400

Sold with 77 keys, warp stanhelm and ausi blutsauger for nebula translator, better used there.

Sale 9: 47

https://backpack.tf/profiles/76561198084126218#!/compare/1546300800/1546473600

https://backpack.tf/profiles/76561198056876856#!/compare/1546646400/1546819200

Sold for 47 pure.

Sale 10: 56

https://backpack.tf/profiles/76561198112336424#!/compare/1541808000/1541894400

https://backpack.tf/profiles/76561198093145483#!/compare/1541721600/1541894400

Sold for frostbite mirror(37) and mallard sack(19).

Sale 11: N/A

https://backpack.tf/profiles/76561198093145483#!/compare/1546646400/1546992000

https://backpack.tf/profiles/76561198080179568#!/compare/1546560000/1546646400

Sold for 33 pure to buy order, excluding.

Minis:

Turbine torcher:

https://steamcommunity.com/market/listings/440/Unusual%20Turbine%20Torcher%20Flame%20Thrower%20%28Minimal%20Wear%29 peaks at £70.64

Sold for 70.64/1.88 = 37.5, rounding to 38

Mirror:

https://backpack.tf/profiles/76561198105071091#!/compare/1544486400/1544572800

Sold for max head + 18 keys, 37 keys

So we've got sales at 27, 41, 43, 45, 47, 53, 56, 57. Excluding 27 because of buyers, going with 41-57.