Hopefully I do this right, only my second pricing.

Majority was copy paste from: https://backpack.tf/suggestion/60ca24f5f5b1e72094718d78

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Previous Traceable Sales of 1 year:

History 1: https://backpack.tf/item/10051884552

Bulk:

https://backpack.tf/profiles/76561198120611167#!/compare/1619308800/1619395200

https://backpack.tf/profiles/76561198087806226#!/compare/1619136000/1619308800

20 keys 28 ref, ~20 keys (keys were ~58 ref):

https://backpack.tf/profiles/76561198087806226#!/compare/1619308800/1619395200

https://backpack.tf/profiles/76561198163549413#!/compare/1619395200/1619481600

~~

History 2: https://backpack.tf/item/8722203717

Sold on Marketplace.tf in May, no buyout

Marketplace.tf: https://marketplace.tf/items/tf2/31045;5;u60

April 30: $34.99/2.01=17.41 ~17 keys

May 29: $29.99/2=14.99 ~15 keys

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Most Recent:

History 3: https://backpack.tf/item/11685421622

Used as 15 Keys in bulk for Burning Fiestibrero:

https://backpack.tf/profiles/76561198353781282#!/compare/1654732800/1654819200

https://backpack.tf/profiles/76561198850274253#!/compare/1654732800/1654819200

https://imgur.com/a/8ew9X8C

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Still Taking 15-20 Keys.