2.33 ref. doesn't look successful atm, so it shouldn't be in the range.

Let's make it 2 ref. flat then, proof:

Selling:

Classifieds:

http://backpack.tf/classifieds/search/989/6/0 - 1 at 2 ref. and 1 at 2.33 ref.

Proof of the above: http://i.imgur.com/pT7WM8x.png

Offers:

http://www.tf2outpost.com/trade/9581323 - New, better keep an eye on this one

http://www.tf2outpost.com/trade/7943964 - Last offer was 3 weeks ago

http://www.tf2outpost.com/trade/9417259 - 6 days old, willing to sell it at 2 ref.

2 ref:

http://www.tf2outpost.com/trade/9386828 - 1 week old, hidden add, no offers

http://www.tf2outpost.com/trade/9571400 - Under 1 day old, no offers

http://www.tf2outpost.com/trade/9526265 - 2 days old, painted, no offers

2.33 ref:

http://www.tf2outpost.com/trade/9580570 - New, no offers

http://www.tf2outpost.com/trade/9405056 - 1 week old, no offers

http://www.tf2outpost.com/trade/9574097 - Under 1 day old, no offers

http://www.tf2outpost.com/trade/9548117 - Backpack.tf prices, so I assume the high end, 1 day old, no offers

http://www.tf2outpost.com/trade/9527126 - 2 days old, no offers

http://www.tf2outpost.com/trade/9217389 - Willing buyer 1 week ago, and there was a 2.66 offer, desperate I guess - http://www.tf2outpost.com/trade/9572238

"Not bumped in a while" trades:

http://www.tf2outpost.com/trade/9493307 - 3 days old, 2.33 ref, no offers

http://www.tf2outpost.com/trade/9575449 - New, 2.33 ref, no offers

http://www.tf2outpost.com/trade/9566138 - 1 day old, 2.33 ref, no offers

http://www.tf2outpost.com/trade/9512938 - 2 days old, offers but it looks like he wants 2.33 ref, no offers

http://www.tf2outpost.com/trade/9446823 - 5 days old, edited from 2.33 to 2.11 ref, no offers

http://www.tf2outpost.com/trade/9045607 - 3 weeks old, edited from 3 to 2 ref, no offers

http://www.tf2outpost.com/trade/9528128 - 2 days old, 2.33 ref, no offers

http://www.tf2outpost.com/trade/9451528 - 4 days old, 2 ref, no offers

http://www.tf2outpost.com/trade/9459916 - 4 days old, 2-2.33 ref, no offers

Buying:

1.66 ref:

http://www.tf2outpost.com/trade/9560573 - 1 day old, no offers

2 ref:

http://www.tf2outpost.com/trade/9553437 - 1 day old, no offers

Conclusion:

2.33 ref. isn't successful, and there's a lot of 2 ref. sellers.

It can't go down to 1.66 ref. just yet, since the buyer at it haven't bought any yet.

There's even a 2 ref. buyer, but it's too young to really use as "counter proof" to myself.

It's the same with the 1.66 ref. buyer, really young, so it's not weird that he haven't had any success yet.

Thanks for reading, please tell me what you think and vote, and have a nice one.