I blame the copy and paste button :(

Redoing this the long way

1 month old price

Classified ads at time of posting:

http://backpack.tf/classifieds/?item=Whoopee%20Cap&quality=6&tradable=1&craftable=1

5*1.33

2*1.44

4*1.55

10*1.66

Unsolds at 1.66 refined:

http://www.tf2outpost.com/trade/22482967 (5 days)

http://www.tf2outpost.com/trade/22503727 (4 days)

http://www.tf2outpost.com/trade/22364216 (1 week)

http://www.tf2outpost.com/trade/21880989 (1 month)

http://www.tf2outpost.com/trade/22510327 (3 days)

http://www.tf2outpost.com/trade/22486020 (4 days)

http://www.tf2outpost.com/trade/22424434 (1 week)

http://www.tf2outpost.com/trade/22391337 (1 week)

http://www.tf2outpost.com/trade/22440261 (1 week)

http://www.tf2outpost.com/trade/22550559 (1 day, young)

http://www.tf2outpost.com/trade/22389864 (1 week)

http://www.tf2outpost.com/trade/22264081 (2 weeks)

http://www.tf2outpost.com/trade/22268121 (2 weeks)

http://www.tf2outpost.com/trade/22510807 (3 days)

http://www.tf2outpost.com/trade/22397816 (1 week)

http://www.tf2outpost.com/trade/22406023 (1 week)

http://www.tf2outpost.com/trade/22414955 (1 week)

http://www.tf2outpost.com/trade/22323180 (2 weeks)

http://www.tf2outpost.com/trade/22402820 (1 week)

http://www.tf2outpost.com/trade/22546420 (1 day, young)

http://www.tf2outpost.com/trade/22329689 (2 weeks)

http://www.tf2outpost.com/trade/22547507 (1 day, young)

http://www.tf2outpost.com/trade/22472625 (5 days)

http://www.tf2outpost.com/trade/22543918 (1 day, young)

http://www.tf2outpost.com/trade/22541840 (2 days, poorly bumped)

http://www.tf2outpost.com/trade/22506969 (4 days, poorly bumped)

http://www.tf2outpost.com/trade/22541060 (2 days, never bumped)

http://www.tf2outpost.com/trade/21798239 (2 days, poorly bumped)

http://www.tf2outpost.com/trade/22493978 (4 days, poorly bumped)

http://www.tf2outpost.com/trade/21737385 (1 week, poorly bumped)

http://www.tf2outpost.com/trade/22490012 (4 days, poorly bumped)

http://www.tf2outpost.com/trade/21933913 (1 month, poorly bumped)

http://www.tf2outpost.com/trade/22487229 (4 days, poorly bumped)

http://www.tf2outpost.com/trade/22235462 (3 weeks, poorly bumped)

http://www.tf2outpost.com/trade/22485110 (4 days, never bumped)

Unsolds at 1.55 refined:

http://www.tf2outpost.com/trade/22294782 (2 weeks)

http://www.tf2outpost.com/trade/22478090 (5 days)

http://www.tf2outpost.com/trade/22493612 (4 days)

Unsolds at 1.44 refined:

http://www.tf2outpost.com/trade/22442551 (1 week)

http://www.tf2outpost.com/trade/22480785 (5 days)

http://www.tf2outpost.com/trade/22476784 (5 days)

http://www.tf2outpost.com/trade/22512043 (3 days)

http://www.tf2outpost.com/trade/22500463 (4 days)

http://www.tf2outpost.com/trade/22321522 (2 weeks)

http://www.tf2outpost.com/trade/22427064 (1 week, poorly bumped)

http://www.tf2outpost.com/trade/22467286 (5 days, never bumped)

Sellers at 1.33 refined:

http://www.tf2outpost.com/trade/22484459

http://www.tf2outpost.com/trade/22529961

http://www.tf2outpost.com/trade/22545345

http://www.tf2outpost.com/trade/22509081

http://www.tf2outpost.com/trade/22559454

http://www.tf2outpost.com/trade/22514420

http://www.tf2outpost.com/trade/22554047

http://www.tf2outpost.com/trade/22551643

http://www.tf2outpost.com/trade/22549344

http://www.tf2outpost.com/trade/22308608

http://www.tf2outpost.com/trade/21882238

This is all I could find on Outpost