Resuggestion, thanks to Foamy for the info!

Sale 1:

https://backpack.tf/profiles/76561198210756877#!/compare/1550880000/1550966400

https://backpack.tf/profiles/76561198846287608#!/compare/1550880000/1550966400

Sold for TW Marauder

Maruader Mini:

https://backpack.tf/suggestion/5cd135b2d3817258cb74df8d

Suggestion for 20.5 keys

Sale 2:

https://backpack.tf/profiles/76561198846287608#!/compare/1551225600/1551398400

https://backpack.tf/profiles/76561198846287608#!/compare/1551225600/1551398400

Sold with Planets Whoopee(10) + ~4 keys in sweets for GE Buckaroo(28.5)

Bulky

Sale 3:

https://backpack.tf/profiles/76561198002757046#!/compare/1551744000/1551830400

https://backpack.tf/profiles/76561198176131425#!/compare/1551744000/1551830400

Sold for 17 keys

Sale 4:

https://backpack.tf/profiles/76561198176131425#!/compare/1551830400/1551916800

https://backpack.tf/profiles/76561198375430785#!/compare/1551830400/1551916800

Sold for CTFL Slouch

Slouch Mini:

https://backpack.tf/suggestion/5cd8d626d38172762e41a607

Suggestion for 15.5 keys

Sale 5:

https://backpack.tf/profiles/76561198375430785#!/compare/1551916800/1552003200

https://backpack.tf/profiles/76561197976524938#!/compare/1551916800/1552003200

Sold for 14 keys

Total sales @:

14, 15.5, 17, 20.5 keys

Sellers at 17 keys,

Buyers up to 13.5 keys,

Foamy's Part:

I would vouch for 14-21 or 16-17 with what I see here. 14's basically at buyers value and is equally likely an outlier as the marauder is in my opinion.

Taking 16 -17 keys, sellers for 17 don't give me any hope that they'll sell soon.