That's a nice rack....

Seller(s)/Buyer(s)

https://gyazo.com/0c7f7321cc5ef5303eef8348a297bbcf

No sellers , highest buyer at 172 keys

https://backpack.tf/item/3419878121

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Sale #1

https://marketplace.tf/items/339;5;u89

Sold for $550 on 1 January.

Keys were $1.76

Proof of key prices

550/1.76 ≈ 312 keys

~ 312 keys

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Sale #2 invalid(untrace)

https://backpack.tf/profiles/76561198064490192#!/compare/1542499200/1542758400

https://backpack.tf/profiles/76561198182552231#!/compare/1541376000/1543017600

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Sale #3 invalid(countered by buyorders)

https://backpack.tf/profiles/76561198106511423#!/compare/1541980800/1542240000

Sold for 166 keys pure

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Sale #4

https://backpack.tf/profiles/76561198053747026#!/compare/1548460800/1548547200

Sold for 28 keys pure + stormy storm beak + bubbling rack (indate)+ steaming rack(indate) +vivid plasma rack

28+70 +34+34+100 = 266

~ 266 keys

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MINIS

Mini for vivid rack:

https://marketplace.tf/items/339;5;u16

Multiple sales at : $178 , $131, $ 167, $158 and 2 at $ 180.

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

Taking key prices on respective dates ,

Sales at : 102 , 74 , 98, 96, 102 ,100

Ignoring, 74 sale...

Thus , rack is ~100 keys

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Mini for stormy beak:

https://backpack.tf/profiles/76561198079679007#!/compare/1548115200/1548201600

Sold for 70 keys pure

Thus , beak is ~70 keys

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Taking above 2 sales, going with ~ 266 - 312 keys

Go find your Paradise...