Resuggesting based on Foamy's comment.

A few recent sale on this Das Hazmattenhatten:

Sale 1-2:

https://marketplace.tf/items/30095;5;u58

Dec 11 30.02 = QS

Jan 14 52.99/1.75 = 30.28 = 30k

Sale 1 is at QB, Excluded; Sale 2 is 30 keys

Sale 3:

https://backpack.tf/profiles/76561198119563409#!/compare/1548115200/1548288000

https://backpack.tf/profiles/76561198062779400#!/compare/1548115200/1548201600

Bulk = Excluding

Sale 4:

https://backpack.tf/profiles/76561198119563409#!/compare/1548288000/1548374400

https://backpack.tf/profiles/76561198106511423#!/compare/1548288000/1548374400

Sold for 27 keys pure

Sale 5:

https://backpack.tf/profiles/76561198380297476#!/compare/1546560000/1547942400

https://backpack.tf/profiles/76561198114811502#!/compare/1547683200/1547942400

Sold for 20 keys = Excluding

Sale 6:

https://backpack.tf/profiles/76561198114811502#!/compare/1547683200/1547942400

https://backpack.tf/profiles/76561198280357510#!/compare/1547856000/1547942400

Sold for DBD Crasher + 6 keys

Mini on the DBD Crasher:

https://backpack.tf/suggestion/5c6b52dd44325a7ac82044cb

20.5 + 6 keys = 26.5 = 27 keys

Sale 7:

https://backpack.tf/profiles/76561198126979379#!/compare/1547856000/1547942400

https://backpack.tf/profiles/76561198280357510#!/compare/1547856000/1547942400

https://imgur.com/ySDDZih

Sold for 5 + Blizzard Field Practice = Use there

Sale 8:

https://backpack.tf/profiles/76561198126979379#!/compare/1548028800/1548201600

https://backpack.tf/profiles/76561198078974915#!/compare/1548028800/1548201600

https://imgur.com/R66YCUQ

Sold for Stormy Le Party

Mini for Le Party:

https://backpack.tf/suggestion/5c5dfdb544325a557072494b

32 Keys = Excluding based on Foamy's comment on previous suggestion.

Taking 27-30 keys