Re-suggestion, thanks to Torb & sin for the help!

Previous suggestion here:

https://backpack.tf/suggestion/5ad6658ecf6c756cc032e9a9#comment-5ad92f0dcf6c7545f33082d0

Sale 1:

https://marketplace.tf/items/246;5;u83

Sold for 55 USD, keys at 1.97, total is ~28 keys

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Sale 2:

https://backpack.tf/profiles/76561198195731583#!/compare/1520985600/1521158400

https://backpack.tf/profiles/76561198292796500#!/compare/1520812800/1521158400

Sold for Duped Cauldron Coupe + 72 Disco Fever(47.5)

Coupe sold instantly for 15 keys + 8.88 ref, taking that.

Fever Mini:

https://backpack.tf/profiles/76561198301644953#!/compare/1523750400/1523836800

Sold for 14 pure

Recent sale for one at ~25 keys on marketplace.tf

https://marketplace.tf/items/30762;5;u3004

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

https://backpack.tf/profiles/76561198305676157#!/compare/1524009600/1524096000

Sold for 15 pure (within a day)

Torb has a a sale at 19 keys, asked him to provide proof in comments.

Considering 15 sold fast, taking 19 to 25, average of 22 keys.

Total is 37 keys.

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Other sales are untraceable/bulk/QS

Taking 28- 37 keys.