Lets counter.

Sale 1: Sold for Searing Plasma Tartan Tyrolean[31 keys]+3 keys

http://www.tf2outpost.com/trade/27776587

http://backpack.tf/profiles/76561198111308334?time=1455004800

http://backpack.tf/profiles/76561198111308334?time=1455091200

31+3=34

Mini on Tyrolean: Sold for Purple Energy Scotch Bonnet[31 keys via mini]

http://backpack.tf/profiles/76561198093791418?time=1454659200

http://backpack.tf/profiles/76561198093791418?time=1454832000

Mini on Scotch Bonnet: Sold for 31 keys.

http://i.imgur.com/wkG4EpG.png?1 ; http://i.imgur.com/JPvGCgD.png?1

Credits to glippy and Fλngmλnn for this sale.

Sale 2: Sold with 3 keys for Circling Heart Virtual Reality Headset[29 keys via mini]

http://www.tf2outpost.com/trade/27774713

http://backpack.tf/profiles/76561198111308334?time=1454054400

http://backpack.tf/profiles/76561198111308334?time=1454140800

29-3=26

Mini on Virtual Reality Headset: Sold for 28 keys+1 key in hats

http://backpack.tf/profiles/76561198058896751?time=1453795200

http://backpack.tf/profiles/76561198058896751?time=1453968000

Sale 3: Sold for 22 keys

http://backpack.tf/profiles/76561198021024511?time=1453968000

http://backpack.tf/profiles/76561198021024511?time=1454054400

Sale 4: Sold for Disco Beat Down Samureye

http://www.tf2outpost.com/trade/27841279

I couldn't find a valid mini on the Samureye, so I'll just ignore this sale.

Sales at 22, 26 and 34 keys. Since sale 2 sold in about a day's worth of time, I'll call 22 an outlier. So making a range of 26-34 keys. Of course, I could be wrong with this decision, so letting me know would be nice ;)