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6 months old price!
Sale 1:
Sold for 20 keys
http://www.tf2outpost.com/trade/28528505
http://backpack.tf/profiles/76561198031371895#!/compare/1476489600/1476576000
Sale 2:
Sold with Kill-a-Watt Charmer's Chapeau + 16 keys for Sunbeams Détective Noir
http://www.tf2outpost.com/trade/28528413
http://backpack.tf/profiles/76561198031371895#!/compare/1475798400/1475884800
http://backpack.tf/profiles/76561198114666650#!/compare/1475798400/1475884800
Sale 3:
Sold for 21 keys + 20.22 ref (rounding to 22 keys)
http://backpack.tf/profiles/76561198115821131#!/compare/1473206400/1473552000
Sale 4:
Sold with sweets (~1) for 21 keys = 20 keys
http://backpack.tf/profiles/76561198115821131#!/compare/1472860800/1472947200
Conclusion:
Three valid sales at 20, 22 and 20 keys. Taking a final range of 20-22 keys.
Feel free to support/counter my suggestion!