3 months old price. Using only clean hats as proof. Proof includes 6 sales in the last 2 weeks + offers on current trades.

CLEAN:

http://www.tf2outpost.com/trade/9225629 - 20 keys pure - SOLD

http://www.tf2outpost.com/trade/9225408 - 26 keys pure - SOLD

http://www.tf2outpost.com/trade/9326993 - highest offer: 28 keys in unusuals

http://www.tf2outpost.com/trade/8973883 - 28.5 keys in unusuals (orb fire hounddog+minor sweets) - SOLD

http://www.tf2outpost.com/trade/9084003 - 30 keys in mixed (bubbling sns + 10 keys in items) - SOLD

http://www.tf2outpost.com/trade/9421201 - B/O 32 keys - no offers yet

http://www.tf2outpost.com/trade/9323688 - B/O 33 keys - no decent offers yet

http://www.tf2outpost.com/trade/9209948 - 35 keys pure - SOLD

http://www.tf2outpost.com/trade/9170365 - B/O 35 keys - seems to have some interest?

DUPED:

http://www.tf2outpost.com/trade/9438050 - selling for 27 keys - no offers

http://www.tf2outpost.com/trade/8427145 - 29 keys in mixed (steaming gatsby+6 keys in items) - SOLD

http://www.tf2outpost.com/trade/8853401 - B/O 30 keys

Conclusions: Not actually much price/demand difference in clean vs duped. Clean has been bought for 20 keys and sold for 35 keys pure, both of which are outliers given the other sales/offers/B/O. Setting low at 26 keys (two bought at that or lower) and 32 keys for high range (multiple b/o at that and 1 sold for higher in pure) with most getting sold somewhere in the middle after accounting for overpay in unusuals/items.