Now that's how you know.

Sale 1: Sold for 40 keys

http://backpack.tf/profiles/76561198066814843#!/compare/1456992000/1457078400

Sale 2: Sold for Circling TF Logo Stout Shako[16.5 keys]+Circling TF Logo Vintage Merryweather[17 keys]+Circling TF Logo Shooter's Sola Topi[14 keys via mini]

http://backpack.tf/profiles/76561198078828216#!/compare/1461715200/1461801600

16.5+17+14=47.5 rounding to 48 keys

Sale 3: Sold for Disco Beat Down Brigade Helm[33 keys via mini]

http://backpack.tf/profiles/76561198127971615#!/compare/1459641600/1459728000

Mini on Brigade Helm: http://backpack.tf/suggestion/57293a25c44045590f67ca02

Mini on Shako:

No usable sales on this. Using old price.

Mini on Merryweather:

No usable sales on this either. Using old price.

Mini on Topi: http://backpack.tf/suggestion/57292fd1c440454ebf05098f

I have sales at 33, 40, and 48. Calling the lowest and highest sales outliers. Making this 40 keys flat.