4 keys aren't getting sold anymore, and 3 keys isn't ready yet.

But it might become.

Proof:

Selling:

Offers:

http://www.tf2outpost.com/trade/8381164 - 3 weeks old, looking for 8 keys, no offers

http://www.tf2outpost.com/trade/8377061 - Selling as a set, got offered 5 keys 1 week ago, rejected, he's only selling it as a set

http://www.tf2outpost.com/trade/8812976 - 2 days old, offered 4 ref, wants around 4 keys

http://www.tf2outpost.com/trade/8845246 - 1 day old, no offers

http://www.tf2outpost.com/trade/7975545 - No new offers

http://www.tf2outpost.com/trade/8514881 - 2 weeks old, the buyout is 4 keys each

http://tf2tp.com/trade.php?trade=9181888 - No offers

3 keys + 2 ref:

http://www.tf2outpost.com/trade/8874320 - Under 1 day old, no offers

4 keys:

http://www.tf2outpost.com/trade/8836185 - 1 day old, no offers

http://www.tf2outpost.com/trade/8773213 - 4 days old, no offers

http://www.tf2outpost.com/trade/8880800 - Under 1 day old, no offers

http://www.tf2outpost.com/trade/8467006 - 2 weeks old, offer of 11 ref, retracted

http://www.tf2outpost.com/trade/8837987 - 1 day old, offer of 3 keys, wants 4 keys

http://www.tf2outpost.com/trade/8738748 - 6 days old, no offers

http://tf2tp.com/trade.php?trade=9180891 - No offers

17 ref./4.5 keys:

http://www.tf2outpost.com/trade/8876593 - Under 1 day old, no offers

4 keys + 1.77 ref./ 17.33 ref:

http://www.tf2outpost.com/trade/8793614 - 3 days old, have been offered a G. dashin' hashshashin (5-6 keys), rejected

5 keys:

http://www.tf2outpost.com/trade/8452337 - 2 weeks old, no offers

http://www.tf2outpost.com/trade/8586832 - 1 week old, one add, but retracted, no other offers

7 keys:

http://www.tf2outpost.com/trade/8446198 - 2 weeks, no offers

Buyers:

Offers:

http://www.tf2outpost.com/trade/8861837 - 1 day old, no offers

2 ref:

http://www.tf2outpost.com/trade/6473664 - 3 months old, offer of 8 keys, rejected, no other offers

2 keys:

http://www.tf2outpost.com/trade/8875905 - Under 1 day old, no offers

2 keys + 2 ref:

http://www.tf2outpost.com/trade/8514037 - 2 weeks old, has bought 1?

12 ref:

http://www.tf2outpost.com/trade/8531814 - 2 weeks old, no offers

3 keys:

http://www.tf2outpost.com/trade/8861697 - Have bought 1 from what it looks like

http://www.tf2outpost.com/trade/8120196 - 1 month old, have been offered 3 keys + 1.77 ref.

3 keys + 1.66 ref:

http://www.tf2outpost.com/trade/8742183 - 6 days old, multiple adds

15 ref:

http://www.tf2outpost.com/trade/8281941 - Has bought some over the last 2 weeks

4 keys:

http://www.tf2outpost.com/trade/8754449 - Not buying

Buyable and sellable at 3.5 keys, but no one buys them at 4 keys anymore.

And 3 keys are hardly touched yet, so I'll just stick to this.

Thanks for reading, and have a nice one. :)