Sale 1:

Sold for Vivid Plasma Modest Metal Pile of Scrap (Suggestion at 54) + 15 keys

No outpost

Seller: https://backpack.tf/profiles/76561198289040457#!/compare/1496448000/1496534400

Buyer: https://backpack.tf/profiles/76561198330927906#!/compare/1496448000/1496534400

X = 69

Sale 2:

Sold for 50 keys

http://www.tf2outpost.com/trade/29235107 - B/O of 50

Seller: https://backpack.tf/profiles/76561198000646505#!/compare/1498262400/1499558400

Buyer: https://backpack.tf/profiles/76561198129341739#!/compare/1498867200/1499212800

X = 50

Sale 3:

Sold for Power Surge Salty Dog (Suggestion at 49)

No outpost

Seller: https://backpack.tf/profiles/76561198310610808#!/compare/1497744000/1497830400

Buyer: https://backpack.tf/profiles/76561198000646505#!/compare/1497657600/1497830400

X = 49

Sale 4:

Sold for $99 on Marketplace.tf

https://marketplace.tf/items/291;5;u62

https://backpack.tf/item/3415439596

99/2.05 = ~48.3

X = 48

Sale 5:

Quicksold for 35 keys

No outpost

Seller: https://backpack.tf/profiles/76561198243355224#!/compare/1500422400/1500508800

Buyer: https://backpack.tf/profiles/76561198292242424#!/compare/1500422400/1500508800

X = 35

Sale 6:

Sold for 33 keys?

http://www.tf2outpost.com/trade/29292607 - B/O of 47

Seller: https://backpack.tf/profiles/76561198041314021#!/compare/1501372800/1501632000

Buyer: https://backpack.tf/profiles/76561198056793444#!/compare/1501459200/1501545600

X = 33

Sale 7:

Quicksold for 33 keys

http://www.tf2outpost.com/trade/29286966 - B/O of 36

Seller: https://backpack.tf/profiles/76561198144068484#!/compare/1500508800/1500595200

Buyer: https://backpack.tf/profiles/76561198154109244#!/compare/1500508800/1500595200

X = 33

Sale 8:

Sold with Peace Sign Safe’n’Sound + ~5 keys in pure/items for Burning Whoopee Cap + ~2 keys in items

No outpost

Seller: https://backpack.tf/profiles/76561198071737757#!/compare/1500336000/1500422400

Buyer: https://backpack.tf/profiles/76561198243355224#!/compare/1500336000/1500422400

Better off being used on the Whoopee.

Sale 9:

Sold with 11 keys for Duped Ghosts Le Party Phantom

http://www.tf2outpost.com/trade/29287829 - B/O of 37

Seller: https://backpack.tf/profiles/76561198064095743#!/compare/1500595200/1500854400

Buyer: https://backpack.tf/profiles/76561198041314021#!/compare/1500768000/1500854400

Better off not using this sale here.

Sale 10:

Sold for Duped Searing Modest

http://www.tf2outpost.com/trade/28867368 - B/O of 55

Seller: https://backpack.tf/profiles/76561198139056850#!/compare/1497571200/1497744000

Buyer: https://backpack.tf/profiles/76561198310610808#!/compare/1497571200/1497744000

Only mini I could find was way over the clean sellers. Excluding this sale. Can be used as a mini on the modest, I suppose.

Abduction Universal Translator: – Credits to Edits

https://backpack.tf/suggestion/5992cb3fcf6c757fec11c396

Power Surge Salty Dog:

https://backpack.tf/suggestion/599ed756cf6c753efe040529

Vivid Plasma Modest Metal Pile of Scrap:

https://backpack.tf/suggestion/599ed8edcf6c755452370b76

Sellers:

45 keys:

http://i.imgur.com/FLdoOLW.png - 13 days

http://i.imgur.com/ZFG0MFC.png - 4 days

http://i.imgur.com/UgOB3uH.jpg - 22 days

Sales at:

33 (2x)

35

48

49

50

69

Sales at 33 and 35 quicksold. Excluding 33 and 35.

69 is a large outlier. Excluding 69.

Sellers at 45. Including 45

Going with 45-50.