14 month old price!

Sale 1:

Sold for Miami Nights Milkman (24.5) + Miami Nights Grenadier's Softcap* (13) + sweets (2.5) = ~40 keys

http://www.tf2outpost.com/trade/27923286

http://backpack.tf/profiles/76561198194628975/#!/compare/1457078400/1457164800

http://backpack.tf/profiles/76561198261183816/#!/compare/1457078400/1457164800

Sale 2:

Unable to identify sale

[no outpost trade]

http://backpack.tf/profiles/76561198066195760/#!/compare/1458198000/1458284400

http://backpack.tf/profiles/76561198194628975/#!/compare/1458198000/1458284400

Sale 3:

Sold for Purple Energy Gym Rat* (28) + 8 keys + sweets (~1) = ~37 keys

http://www.tf2outpost.com/trade/27979029

http://backpack.tf/profiles/76561198087384465/#!/compare/1458025200/1458543600

Mini-suggestion for Miami Nights Grenadier's Softcap*:

http://backpack.tf/profiles/76561198194628975/#!/compare/1457078400/1457164800

http://backpack.tf/profiles/76561198261183816/#!/compare/1457078400/1457164800

bunsen brave sold for items + miami softcap, which miami softcap then sold for 13 keys

~ Taking a value of 13 keys

Conclusion:

Two valid sales at 40 and 37 keys. Taking a final range of 37-40 keys.

Feel free to support/counter my suggestion!