Resuggestion, thanks Polar for the info!

Sale 1:

https://backpack.tf/profiles/76561197964491324#!/compare/1563494400/1564012800

https://backpack.tf/profiles/76561198021055079#!/compare/1563667200/1563753600

QS

sale 2:

https://backpack.tf/profiles/76561198021055079#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198311838670#!/compare/1568246400/1568678400

Sold for 22 keys

sale 3:

https://backpack.tf/profiles/76561198311838670#!/compare/1568678400/1568937600

https://backpack.tf/profiles/76561198079468968#!/compare/1568073600/1568937600

Bulk

Sale 4:

https://backpack.tf/profiles/76561198083134207#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198141232666#!/compare/1562284800/1562371200

Sold for Stormy Ushanka(21)

Sale 5:

https://backpack.tf/profiles/76561198141232666#!/compare/1564617600/1564790400

https://backpack.tf/profiles/76561198067699902#!/compare/1564358400/1564617600

Sold for 14 keys

sale 6:

https://backpack.tf/profiles/76561198067699902#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561198311723891#!/compare/1566086400/1566432000

Sold for Neutron Titanium Pillar + 2 keys

use there

New poorly bumped seller for 20 keys,

https://i.imgur.com/Ow9VVCF.png

https://backpack.tf/item/6708617922

buyers up to 16 keys,

Polar's Part:

The seller at 20 has sold several times all for less than 20. Current buyer is reselling with a b/o of 20.

Sale 7:

https://backpack.tf/profiles/76561198079468968#!/compare/1569628800/1569715200

https://backpack.tf/profiles/76561198089664680#!/compare/1569628800/1569715200

sold for 17 keys

Sale 8:

https://backpack.tf/profiles/76561198089664680#!/compare/1569715200/1569801600

https://backpack.tf/profiles/76561198177838739#!/compare/1569715200/1569801600

Sold for PE Puglist(17) + 2 keys

Total is 19 keys

19-22 sounds good.