Resuggestion, thanks to K1ng for the info!

Sale 1:

https://backpack.tf/profiles/76561198305494036#!/compare/1563235200/1563321600

https://backpack.tf/profiles/76561198062615362#!/compare/1563235200/1564358400

Sold for Duped Beams tree

Tree Mini:

https://backpack.tf/profiles/76561198069118738#!/compare/1562716800/1562976000

https://backpack.tf/profiles/76561198337734785#!/compare/1562803200/1562976000

QS

https://backpack.tf/profiles/76561198337734785#!/compare/1563148800/1563235200

https://backpack.tf/profiles/76561198062615362#!/compare/1563062400/1563235200

Keys

https://backpack.tf/profiles/76561198305494036#!/compare/1565481600/1565568000

https://backpack.tf/profiles/76561198867208675#!/compare/1565481600/1565568000

Sold for 44 keys

https://backpack.tf/profiles/76561198867208675#!/compare/1565740800/1565827200

https://backpack.tf/profiles/76561198316071886#!/compare/1565740800/1565827200

Sold for 47 keys

https://backpack.tf/profiles/76561198085711378#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198232041512#!/compare/1566604800/1566691200

Bulk

https://marketplace.tf/items/tf2/341;5;u17

$89.5 / $1.82 = 49.18 keys

https://backpack.tf/item/469934672

Taking 44 - 49 keys, average of 46.5 keys

https://bot.tf/stats/listings/Y9NEKZWY

B/O of 50 keys

Sale 2:

https://backpack.tf/profiles/76561198062615362#!/compare/1564358400/1564444800

https://backpack.tf/profiles/76561198800376958#!/compare/1564272000/1564444800

Sold with Grail Square for Searing Gibus

Sale 3:

https://backpack.tf/profiles/76561198275012706#!/compare/1563321600/1563408000

https://backpack.tf/profiles/76561198305494036#!/compare/1563321600/1563408000

Sold for ~46 keys

Sale 4:

https://marketplace.tf/items/tf2/30362;5;u30;strange

$80.85 / $1.83 = 44.18 keys

Sale 5, 6:

https://marketplace.tf/items/tf2/30362;5;u30

$71.46 / $1.83 = 39.05 keys

$99.99 / $1.80 = 55.55 keys

Total sales @:

39, 44, 46, 46.5, 55.55 keys

buyers up to 27 keys,

listings for 34 and 35 dropping from higher listings...

https://bot.tf/stats/listings/425OJK7G

https://bot.tf/stats/listings/MLR6368J

https://bot.tf/stats/listings/MLR6X9ZJ

calling 56+ high,

K1ng's Part:

Bulk

https://backpack.tf/profiles/76561198149175706#!/compare/1568592000/1568764800

38 keys I think

https://backpack.tf/profiles/76561198149175706#!/compare/1565481600/1565740800

https://backpack.tf/profiles/76561198105305615#!/compare/1565654400/1565740800

36 keys

https://backpack.tf/profiles/76561198083418912#!/compare/1565395200/1565481600

https://backpack.tf/profiles/76561198105305615#!/compare/1564704000/1565481600

Vivid Ninja, better there

https://backpack.tf/profiles/76561198083418912#!/compare/1563926400/1564012800

https://backpack.tf/profiles/76561198342161127#!/compare/1563926400/1564012800

So I would include 35 in range already, with 36 supporting it.

Taking 35 - 47 keys