Wait, why'd I re-suggest for a 0.5 key change...

Whatever, too late now. Thanks Bob and Marty.

Sale1: Sold for 18 keys

http://backpack.tf/profiles/76561198198082470/#!/compare/1460505600/1460851200

Sale 2: Sold for 15 keys

http://backpack.tf/profiles/76561198047822818/#!/compare/1460505600/1460592000

Sale 3: Sold for 19 keys+19 refined[1 key]

http://backpack.tf/profiles/76561198071995863/#!/compare/1456387200/1457164800

19+1=20 keys

Sale 4: Sold for 21 keys

http://www.tf2outpost.com/trade/28000249

http://backpack.tf/profiles/76561198118485069/#!/compare/1459036800/1459123200

Thanks Bob for correcting me on this sale.

Buyers

http://www.tf2outpost.com/trade/27760190 - 15 keys

Seller at 20 keys

https://gyazo.com/aef59b3171fe2aa4c0d1695edd432ad3.png

I have sales at 15, 18, 20, and 21. Buyer at 15 shows 15 is low. Making this a range of 18-21 keys.