Lots of sellers for 4 keys

The Way I look at it is that buyer always pays for wrap, if there is pre wraped for 5 keys that means the hat is 4 keys and the wrap is 1 key. Backpack.tf goes by price of the hat itself and not the wrap included.

4 Keys

http://www.tf2outpost.com/trade/9377006

http://www.tf2outpost.com/trade/9173336

http://www.tf2outpost.com/trade/9291125

http://www.tf2outpost.com/trade/9363651

http://www.tf2outpost.com/trade/8952227 - Accepted 4 keys

http://www.tf2outpost.com/trade/9357316

http://www.tf2outpost.com/trade/9371797

http://www.tf2outpost.com/trade/9323056

http://www.tf2outpost.com/trade/9260171

http://www.tf2outpost.com/trade/9221584 - pre wrapped for a frontier justice

Unsold (Don't have much proof of not selling for 5 as most people sell for 4)

http://www.tf2outpost.com/trade/9022502 - 4 keys + 1.33

http://www.tf2outpost.com/trade/9368775

http://www.tf2outpost.com/trade/9242061 - 4 days

As you can see there are plenty of sellers for 4 keys.