Resuggestion from https://backpack.tf/suggestion/5ebbd2dccf1e546f2e5a0d5a

None of the proof is mine, so I am copy pasting the relevant information as-is:

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Proof by https://backpack.tf/u/76561198231709968

Sale 1 : https://backpack.tf/profiles/76561197964546925#!/compare/1585094400/1585180800

SCM sale.

Sale 2 : https://backpack.tf/profiles/76561198055822245#!/compare/1584144000/1584230400

Sold with 10 keys + 3 key sweets for Spec KS. Australium Rocket Launcher (35k) = 35-13 = 22 keys

Sale 3 : https://backpack.tf/profiles/76561198055822245#!/compare/1584230400/1584403200

27 keys? Couldn't find history.

Sale 4 : https://backpack.tf/profiles/76561198254882979#!/compare/1586217600/1586304000

huge bulk

Sale 5 : https://backpack.tf/profiles/76561197995152235#!/compare/1586908800/1587081600

1:1 Tesla Coil Kiss King (33 k https://backpack.tf/suggestion/5eb083717fec5009d861e7aa)

Mp.tf sale: $55

https://marketplace.tf/items/tf2/31091;5;u19

keys were $1.69 = 32.54 k, rounded to 33 keys.

Sales are 22, 27?, 33, 33

Young seller for 29

Going with 27-33

https://backpack.tf/suggestion/5eb08961c56126453c4dcf7d

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Proof by https://backpack.tf/u/76561198085880346

https://marketplace.tf/items/tf2/31091;5;u19 - Sold for $70 (high), and $55 (28 Keys)

https://backpack.tf/profiles/76561198071597717#!/compare/1591833600/1592179200 - Cloud 9 Executioner (17 Keys) + 1 Key

https://backpack.tf/profiles/76561198342161127#!/compare/1592352000/1592438400 - Likely 28 Keys (IDs are very close)

The Tesla Coil Kiss King was updated to 29.5 Keys, so Sale 5 will be 30 Keys. Since the histories/IDs don't match for the 27 Key sale, it should be excluded.

I'd slim the range to 28 - 30 Keys, as the Seller at 30 Keys has been there for over a month (it was originally 28 and raised to 30).

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Going with 28-30 keys