Suggestion partially done by Scourge

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Sale 1:

https://marketplace.tf/items/tf2/30748;5;u7

$68.99 / $1.71 = 40.35 keys <----- https://backpack.tf/item/6154927471

sale 2:

https://backpack.tf/profiles/76561197989484727#!/compare/1586217600/1589241600

https://backpack.tf/profiles/76561198420227358#!/compare/1585699200/1587772800

Bulk

Sale 3:

https://backpack.tf/profiles/76561198128923241#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198259183894#!/compare/1582934400/1583020800

Sold for 20 keys

sale 4:

https://backpack.tf/profiles/76561198259183894#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198077870175#!/compare/1582934400/1583020800

Sold for Snowblinded Missing

low, given recent sellers

sale 5:

https://backpack.tf/profiles/76561198077870175#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198374204787#!/compare/1582934400/1583020800

Sold for DBD Condor

https://backpack.tf/suggestion/5ec489e306a1287d7c643d82

https://bot.tf/stats/listings/MVRVGO02

B/O of 37 keys

Sale = 28.5 keys

sale 6:

https://backpack.tf/profiles/76561198374204787#!/compare/1583020800/1583107200

https://backpack.tf/profiles/76561198061779536#!/compare/1582761600/1583020800

QS

sale 7:

https://backpack.tf/profiles/76561198061779536#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198185579770#!/compare/1586044800/1586131200

Sold for HG HoC + 3 keys

Using there, as it has less sales

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Sales:

20

28.5

40

https://gyazo.com/80c4967299d95b607a4c8b5e07a87b26

Buyers 16

Haunted Ghosts HOC is closer to 20-30 than it is to 30-40

And lower buyout on the Condor sale leads me to think that 40 is high

As well as the Snowblinded Missing Piece sale

Going with 20-29 keys