3 sales

1) Scorching Flames Defiant Spartan (84) + Smoking Whoopee Cap (13) + Orbiting Planets Bubble Pipe (19) + '72 The Proletariat Posedown (5) + 6 keys + 2 keys in items

https://backpack.tf/profiles/76561198081943134#!/compare/1552608000/1552780800

https://backpack.tf/profiles/76561198062561069#!/compare/1552694400/1552780800

Spartan sold for $150 on March 4th, keys were $1.79

https://marketplace.tf/items/340;5;u14

150/1.79 ≈ 84 keys

Whoopee sold for $22.5 on January 22nd, keys were $1.75

https://marketplace.tf/items/174;5;u35

22.5/1.75 ≈ 13 keys

Pipe has a 19 key seller for 3+ months

https://backpack.tf/stats/Unusual/Bubble%20Pipe/Tradable/Craftable/32

https://imgur.com/iqAJsxC

Posedown

https://backpack.tf/stats/Unusual/Taunt%3A%20The%20Proletariat%20Posedown/Tradable/Craftable/3004

84 + 13 + 19 + 5 + 6 + 2 = 129

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2) Vivid Plasma Chill Chullo (125) + 18 keys

https://backpack.tf/profiles/76561198130834456#!/compare/1553904000/1553990400

https://backpack.tf/profiles/76561198232041512#!/compare/1553904000/1553990400

Chill

https://backpack.tf/suggestion/5c72a130d38172477341c040

125 + 18 = 143

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https://marketplace.tf/items/30553;5;u17

3) $216 on March 9th, keys were $1.8

216/1.8 = 120 keys

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Total: 120, 129, 143. Rounded to 120-145.

If you will find other sales, you're welcome to report them.

Messed up whoopee mini, idk where did I get $22.5 from... New mini on it: $18.4 on March 16th, keys were $1.79

https://marketplace.tf/items/174;5;u35

18.4/1.79 = 10 keys

But this doesn't affect to the range.

New sales:

4) Bulk?

https://backpack.tf/profiles/76561198248296912#!/compare/1555372800/1555459200

https://backpack.tf/profiles/76561198016663834#!/compare/1555372800/1555459200

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5) Searing Plasma Merc's Mohawk? Not sure.

https://backpack.tf/profiles/76561198016663834#!/compare/1554681600/1554768000

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6) ?

https://backpack.tf/profiles/76561198175019602#!/compare/1554595200/1554681600

https://backpack.tf/profiles/76561198027152204#!/compare/1554595200/1554681600

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Nothing usable here.

New sale: 92 keys

https://backpack.tf/profiles/76561198132844160#!/compare/1556236800/1556323200

I don't know, should I include this sale or not since it is a mann co store trade; waiting for mod's response