Resuggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561198168319836#!/compare/1569283200/1569974400

https://backpack.tf/profiles/76561198006544512#!/compare/1569888000/1569974400

Sold for PE Noble + 2 keys

Noble Mini:

https://backpack.tf/suggestion/5dd8c2b5d38172574d1ff709

Suggestion for 41 keys

Total is 43 keys

sale 2:

https://backpack.tf/profiles/76561198145613630#!/compare/1569974400/1570665600

https://backpack.tf/profiles/76561198149512315#!/compare/1570406400/1570492800

Untrace

Sale 3:

https://marketplace.tf/items/tf2/338;5;u13

$100 / $1.81 = 55.25 keys

$80.05 / $1.76 = 45.48 keys

can't tell if above are duped or not. not using.

Taking 43 flat.

Mindacos' Part:

Two new marketplace sales: one at $70.10(~40 Keys) and one at $80.00(~45 Keys). I don't think the marketplace sales should be ignored. And if they are all dupe sales somehow, then that means that the duped variants are actively selling higher than the clean ones, essentially meaning dupe = clean.

You should look into duped sales to figure out if this is correct or not.

https://backpack.tf/profiles/76561198060201259#!/compare/1571184000/1571616000

https://backpack.tf/profiles/76561198197292179#!/compare/1571788800/1571875200

untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198210598009#!/compare/1572307200/1572393600

Keys, can trace 1

https://bot.tf/stats/listings/4OV3ZGNP

probably for buyout.

https://backpack.tf/profiles/76561198210598009#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198097271466#!/compare/1572307200/1572393600

Sold for 37 keys QS(?)

given the sales, and that the seller for 50 and 44 from MPTF are now ghost sellers, (44 would be one of the new sellers,but can't tell which one it is)

would taking 40 - 45 be ideal?

Yeah, 40-45 should be fine.