Sale 1:

Sold for Fountain of Delight High Five

http://www.tf2outpost.com/trade/27657960 - B/O of 200ish

Seller: http://backpack.tf/profiles/76561198026799664/#!/compare/1453190400/1454054400

Buyer: http://backpack.tf/profiles/76561198012202276/#!/compare/1453708800/1454054400 (Unhelpful link)

No recent sales on the High Five. This sale can be used to update it.

Sale 2:

Sold for 180 keys

http://www.tf2outpost.com/trade/27630123 - B/O of 160 keys?

Seller: http://backpack.tf/profiles/76561198001106243/#!/compare/1451635200/1451721600

Buyer: http://backpack.tf/profiles/76561198011468491/#!/compare/1451635200/1451808000 (Unhelpful link)

X = 180

Capped by B/O of 160

Not capping, due to it being a pure sale.

Sale 3:

Sold for Demonflame Brainiac Hairpiece

http://www.tf2outpost.com/trade/27627475

Seller: http://backpack.tf/profiles/76561197961465738/#!/compare/1451635200/1451721600 (Unhelpful link)

Buyer: http://backpack.tf/profiles/76561197989331334/#!/compare/1451376000/1452067200

No keys were added, according to key histories, but I could be wrong here.

No recent sales on the Brainiac Hairpiece. This can be used to update it.

Sale 4: Not using

Bulk sale for Purple Energy Killer Exclusive

http://www.tf2outpost.com/trade/27781478

Seller: http://backpack.tf/profiles/76561198043457018/#!/compare/1454227200/1454313600

Buyer: http://backpack.tf/profiles/76561197997268820/#!/compare/1454227200/1454313600

Outpost Sellers:

159:

http://www.tf2outpost.com/trade/27789585 - 2 weeks

165:

http://www.tf2outpost.com/trade/27832924 - 5 days, "quickselling"

200:

http://www.tf2outpost.com/trade/26399478 - 7 months

One sale at 180

Seller at 159 and 165

Going with 160-180 (rounding the low-end)