Re-suggestion, thanks to K1NG for the info!

Sale 1:

https://marketplace.tf/items/759;5;u13

Sold for $140 USD, keys @ 1.98, total is ~70.7 keys

Sale 2:

https://backpack.tf/profiles/76561198063562131#!/compare/1519862400/1520208000

Bulk sale.

Sale 3:

https://backpack.tf/profiles/76561198052576107#!/compare/1520208000/1522368000

https://backpack.tf/profiles/76561198192602363#!/compare/1520121600/1520208000

Sold for HG Reggae

Reggae Mini:

https://backpack.tf/profiles/76561198077044158#!/compare/1516924800/1522972800

Sold with Spec KS Orignal(11) for KaW Shaman(64)

Total is 53 keys.

Only good sale, taking 53.

Sale 4:

https://backpack.tf/profiles/76561198073438708#!/compare/1524009600/1524096000

Sold for 53 keys + 10 ref

Sale 5:

https://backpack.tf/profiles/76561198073438708#!/compare/1523923200/1524009600

Sold for 52 keys + 14.44 ref

Sale 6:

https://backpack.tf/profiles/76561197994697258#!/compare/1523923200/1524009600

Untraceable.

Sales @:

52.53, 53, 53.36, 70.7

52 + 53 are close to QS, calling outlier.

Considering sellers, taking 64 - 71 keys.

K1NG's Part:

Plenty of unsolds below 71, so that sale is certainly an outlier. I would go with 52-53 here even if they were quicksales, as it clearly can't sell for much more than that, and there are sellers at around these numbers in classies and marketplace right now.