Sellers:

https://marketplace.tf/items/52;5;u35

https://backpack.tf/item/808089220

https://backpack.tf/item/583822241

http://www.tf2outpost.com/trade/29221349 - b/o: $30.34 = 15 keys

http://www.tf2outpost.com/trade/29226897

http://www.tf2outpost.com/trade/28729897 - b/o: 13 keys (4 months)

Sold:

http://www.tf2outpost.com/trade/28900664

https://backpack.tf/profiles/76561198194454767#!/compare/1494028800/1494115200 - sold for 9 keys + sweets (1) = 10 keys (low)

http://www.tf2outpost.com/trade/28897990

https://backpack.tf/profiles/76561198168997670#!/compare/1493164800/1493424000 - sold for Circling Peace Sign Carouser's Capotain (13) = 12 keys b/o

http://www.tf2outpost.com/trade/28888964

https://backpack.tf/profiles/76561198083940396#!/compare/1493078400/1493164800

https://backpack.tf/profiles/76561198168997670#!/compare/1492646400/1493164800 - ?

https://backpack.tf/profiles/76561198083940396#!/compare/1492819200/1492905600 - ?

https://backpack.tf/profiles/76561198277594872#!/compare/1490572800/1492819200 - bulk

http://www.tf2outpost.com/trade/28883888

https://backpack.tf/profiles/76561198036221461#!/compare/1492992000/1493164800

https://backpack.tf/profiles/76561198132654022#!/compare/1445065200/1495411200 - ?

http://www.tf2outpost.com/trade/28882309

https://backpack.tf/profiles/76561198179218222#!/compare/1492473600/1492560000 - sold for 11 keys

https://backpack.tf/profiles/76561198179218222#!/compare/1492300800/1492387200 - ?

http://www.tf2outpost.com/trade/28876259

https://backpack.tf/profiles/76561198242862918#!/compare/1492300800/1492387200 - sold for 10 keys (quicksold)

https://backpack.tf/profiles/76561198110254941#!/compare/1492041600/1492128000 - sold for Strange Australium Force-A-Nature (10) = 10 keys (low)

http://www.tf2outpost.com/trade/28864563

https://backpack.tf/profiles/76561198061717026#!/compare/1491696000/1491782400 - sold with 6 keys for Smoking Tyrant's Helm (19) = 13 keys

https://backpack.tf/profiles/76561198094492103#!/compare/1494374400/1494460800 - sold with sweets (3) for Stormy Storm Whoopee Cap (15) = 12 keys

http://www.tf2outpost.com/trade/28907645

https://backpack.tf/profiles/76561198200072598#!/compare/1493769600/1493856000 - sold for Circling Peace Sign Sober Stuntman (12) = 12 keys

https://backpack.tf/profiles/76561198110747621#!/compare/1493078400/1493164800 - sold for 10 keys (quicksold)

https://backpack.tf/profiles/76561198169455956#!/compare/1492473600/1493164800 - sold with sweets (1) for Smoking Dr's Dapper Topper (30) = 29 keys (outlier)

https://backpack.tf/profiles/76561198117971944#!/compare/1496016000/1496102400 - ?

Mini’s:

Smoking Tyrant's Helm:

https://backpack.tf/suggestion/5945ae8b0e2cad526951a2de = 19 keys

Circling Peace Sign Sober Stuntman:

https://backpack.tf/suggestion/5946d6950e2cad1d3d0c02c0 = 12 keys

Conclusion:

sales at 10, 10, 10, 10, 11, 12, 12, 12, 13, 29

taking 11-13 keys