Sale 1:

Sold for Stormy Storm Professional’s Ushanka (Mini at 61 below)

http://www.tf2outpost.com/trade/28624659 - No B/O

Seller: http://backpack.tf/profiles/76561198079515445#!/compare/1480118400/1480204800

Buyer: http://backpack.tf/profiles/76561198307580931#!/compare/1480032000/1480118400

X = 61

Sale 2:

Sold for Cloudy Moon Fruit Shoot (Mini at 47.5 below)+ 11 keys

http://www.tf2outpost.com/trade/28641387 - No B/O

Seller: http://backpack.tf/profiles/76561198267189538#!/compare/1480636800/1480723200

Buyer: http://backpack.tf/profiles/76561198068282459#!/compare/1480204800/1480723200

X = 59

Sale 3:

Sold for DBD Bot Dogger (Mini at 37.5 below) + Spec. KS Aussie Black Box (15) + ~6 keys in items

http://www.tf2outpost.com/trade/28667707 - No visible B/O

Seller: http://backpack.tf/profiles/76561198192602363#!/compare/1486166400/1486252800

Buyer: http://backpack.tf/profiles/76561198071012049#!/compare/1486166400/1486252800

X = 59

Sale 4:

Sold for Disco Beat Down Cosa Nostra Cap (45)

No outpost

Seller: http://backpack.tf/profiles/76561198087831690#!/compare/1480636800/1480723200

Buyer: http://backpack.tf/profiles/76561198051032766#!/compare/1480636800/1480723200

X = 45

Sale 5:

Bulk for Ooze Screamin’ Eagle

Seller: http://backpack.tf/profiles/76561198211445756#!/compare/1480896000/1480982400

Buyer: http://backpack.tf/profiles/76561198192602363#!/compare/1480896000/1480982400

Sale 6:

Sold with 17 keys for Miami Nights War Pig

Seller: http://backpack.tf/profiles/76561198071012049#!/compare/1486425600/1486512000

Buyer: http://backpack.tf/profiles/76561198004517334#!/compare/1486425600/1486512000

Should be used to update the War Pig

Sale 7:

Sold with 16 keys for Knifestorm One-Man Army

Seller: http://backpack.tf/profiles/76561198055261127#!/compare/1487116800/1487548800

Buyer: http://backpack.tf/profiles/76561198018823628#!/compare/1487030400/1487116800

Should be used to update the One-Man Army

Cloudy Moon Fruit Shoot Mini:

http://backpack.tf/suggestion/58ab03fbe33877120e153a62

Stormy Professional’s Ushanka Mini:

http://backpack.tf/suggestion/58ab0796e3387777955453bf

DBD Bot Dogger Mini:

http://backpack.tf/suggestion/58ab0fcb0e2cad0ec434ce2b

Sellers:

54 keys:

http://i.imgur.com/InBxOPK.png - 3 days

http://backpack.tf/u/76561198018823628

http://www.tf2outpost.com/trade/28785002

http://i.imgur.com/R77agdT.png - 2 days

http://backpack.tf/u/76561197993989727

http://www.tf2outpost.com/trade/28777094 - 1 week, probably lowered here, 2 days ago.

55 keys:

http://i.imgur.com/ggxZ6Pv.png

http://backpack.tf/u/76561198004517334

http://www.tf2outpost.com/trade/28778618

59 keys:

http://i.imgur.com/qqb3wJR.png

http://backpack.tf/u/76561198054758757

http://www.tf2outpost.com/trade/28776503

68 keys:

http://i.imgur.com/kjDu4hQ.png

http://backpack.tf/u/76561197978210095

Sales at:

45

59 (2x)

61

Given the amount of sales higher than 45, and the gap between the sale at 45 and the next highest sale, 45 would seem to be an outlier. Excluding 45.

Seller at 59 is 3 months old. Would be best to not exceed 59. Excluding 61.

Multiple sellers at 54 and 55. Putting 54 in the range.

Going with 54-59.