Only one with recent sales: https://backpack.tf/item/2032757149

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Sale 1: Done to Naiveté

Done: https://backpack.tf/profiles/76561198130948401#!/compare/1532131200/1532304000

Naiveté: https://backpack.tf/profiles/76561198052769449#!/compare/1532131200/1534896000 (not much use)

Sold for:

Massed Flies Dr's Dapper Topper (https://backpack.tf/item/730048593) -- in date, 19 keys

Bubbling Rotation Sensation (https://backpack.tf/item/4094568082) -- outdated price

Aces High Rotation Sensation (https://backpack.tf/item/7000428889) -- outdated price

Green Energy Rotation Sensation (https://backpack.tf/item/6983409709) -- in date, 110 keys

Strange Killstreak Batsaber (https://backpack.tf/item/5450885470) -- using backpack.tf suggested price of 36.15 keys

44 keys pure

Minis:

Bubbling Rotation Sensation -- two September sales here: https://marketplace.tf/items/30623;5;u34

$40.13 - http://manic.tf/keyprice/?at=2018-09-16, making it 21.69 keys

$50.56 - http://manic.tf/keyprice/?at=2018-09-07, making it 26.89 keys

Median of those two is 24.29 keys, though there is an unsold at 22.28 keys for four days in the classifieds. https://gyazo.com/d3b3f5b3a94d625da3602e6308b3de22

However, let's see whether Done managed to sell it for less (because it can't be more), otherwise I'm going with 22.28.

Bulk for a Scorching Flames Crit Cloak:

https://backpack.tf/profiles/76561198130948401#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198070445235#!/compare/1533600000/1533686400

Let's settle for 22.28 keys.

Aces High Rotation Sensation -- Done sold it off shortly after:

https://backpack.tf/profiles/76561198130948401#!/compare/1533081600/1533254400

26 keys and a Professional Killstreak Frontier Justice Kit.

Pricing kit with the bp.tf suggested value, of 4.87

Total is 30.87 keys, which is in line with current classified sellers, so we're going with this.

Unknown B/O: http://www.tf2outpost.com/trade/29720130, but given it was for pure, it's hopefully safe to assume this is fine

That totals to: 44+36.15+110+19+22.28+30.87=262.3 keys, rounding to 262.

B/O at 230 keys: http://www.tf2outpost.com/trade/29705995

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Sale 2: Naiveté to Sunjar

No B/O: http://www.tf2outpost.com/user/76561198052769449

Naiveté : https://backpack.tf/profiles/76561198052769449#!/compare/1533686400/1533772800

Sunjar: https://backpack.tf/profiles/76561198139171368#!/compare/1533686400/1533772800

1:3 for:

Sunbeams Trash Man (https://backpack.tf/item/6506038136) -- in date, 55 keys

Steaming Virtual Viewfinder (https://backpack.tf/item/3993459415)

Stare From Beyond Bruce's Bonnet (https://backpack.tf/item/4277646403)

Minis:

Stare From Beyond Bruce's Bonnet: https://backpack.tf/suggestion/5ba5ff9944325a3bb35e4c5d

Steaming Virtual Viewfinder: Using what Sunjar bought it for.

Sunjar: https://backpack.tf/profiles/76561198139171368#!/compare/1533513600/1533600000

xxxPamajito: https://backpack.tf/profiles/76561198154468892#!/compare/1533427200/1533686400

Viewfinder + sweets for Cloud 9 Virtual Viewfinder.

Sweets total at 4.85+1.63+7.22=13.7 keys

Micro for Cloud 9 Virtual Viewfinder:

$319.99 - http://manic.tf/keyprice/?at=2018-08-03, becoming 168.42 keys

This is a little under the classifieds, but is hopefully sufficient.

That means we're valuing the Viewfinder at 168.42-13.7

This totals to: 55+62+154.72=271.72

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Sunjar currently has a B/O of 220 keys.

https://gyazo.com/2dc50b4bceac1bc04f02d7a2309ba4c7

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Sale 2 is obviously too high, given Sunjar currently has a B/O at 220 (and was at 250). Either that, or I've done something wrong somewhere. I'm always open to constructive criticism, so let me know if I went wrong.

Given sale 1 is the only usable one, we're going with 230. This is a pretty high tier hat, so a 10 key discrepancy between the price and a seller isn't much to write home about. If he stays unsold, I'll put that as the low end.