Hark, the herald angels are zapped.

https://backpack.tf/item/5193927312

Sale 1) Sold + 5 Keys for a Neutron Star Runner's Warm-Up (33.5 Keys)

https://backpack.tf/profiles/76561198145599954#!/compare/1508630400/1508716800

High Outlier.

Sale 2) Sold + 7 Keys for a Circling TF Logo El Jefe (32 Keys)

https://backpack.tf/profiles/76561198189988855#!/compare/1508716800/1508803200 - Seller's Backpack

https://backpack.tf/profiles/76561198158482500#!/compare/1508716800/1508803200 - Buyer's Backpack

32 - 7 = 25 Keys

Sale 3) Sold for a Haunted Chicken Kiev (10.5 Keys) + Australium Force-a-Nature (9.15 Keys)

https://backpack.tf/profiles/76561198158482500#!/compare/1508716800/1508803200

10.5 + 9.15 = 19.65, which rounds to 20 Keys

Sale 4) Sold for a FN Cool Bamboo Brushed Iron Bomber

https://backpack.tf/profiles/76561198262371175#!/compare/1511049600/1511136000

This would be better used to price the Iron.

Sale 5) Sold for 17 Keys

https://backpack.tf/profiles/76561198055622215#!/compare/1515196800/1515283200

Low Outlier.

Sale 6) Quicksold for 18 Keys

https://backpack.tf/profiles/76561198118099681#!/compare/1515283200/1515369600 - Buyer's Backpack

https://imgur.com/a/hUi0S - This 2 Month Unsold at 25 Keys rules 29 high.