Unsold at 2 keys:

http://www.tf2outpost.com/trade/10135411 (1 week, the guy hid his own post + that was before the price change)

http://www.tf2outpost.com/trade/9377788 (1 month, but let's just count the days after the price was changed to 1.75-2 keys, so 4 days)

http://www.tf2outpost.com/trade/10274216 (2 days)

http://www.tf2outpost.com/trade/10115352 (1 week)

http://www.tf2outpost.com/trade/10276579 (2 days)

http://www.tf2outpost.com/trade/10224232 (B/O at 2 keys, 4 days)

http://www.tf2outpost.com/trade/10152430 (1 week)

http://www.tf2outpost.com/trade/10294135 (1 day)

http://www.tf2outpost.com/trade/10234817 (3 days, maybe people do care that it's gifted, but too bad I'm using it)

http://www.tf2outpost.com/trade/10294445 (1 day)

http://www.tf2outpost.com/trade/10186245 (5 days)

Willing to sell at, or below 1.75 keys

http://www.tf2outpost.com/trade/10301489

http://www.tf2outpost.com/trade/10273804 (1 key, :| I bet everyone's gonna rush to add him after this)

http://www.tf2outpost.com/trade/10301280 (1 craft hat + holiday punch for 2 keys)

http://www.tf2outpost.com/trade/10317238 (1 key 2 refined)

http://www.tf2outpost.com/trade/10319752 (1.5 keys)

http://www.tf2outpost.com/trade/10236530 (1.5 keys, 3 days unsold)

Sorry I couldn't get more proof, everything else was either long time unbumped, waiting for offers, or selling as crate #40 set.