OK, Thanks to an awesome chad in the comments I can fix an error I missed! Im too lazy to format it myself so I'm gonna use the text from the last suggestion but this time I will include their comment in the very bottom so you can use their comment as the evidence for the new range.

-THANKS TO Beaser FOR THE HELP!!!

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May 20 key price - $1.88

Key price at time of most recent sale on marketplace.tf - $1.88

40/1.88 = 21~ keys

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Also sold by a bot

https://backpack.tf/profiles/76561198358296372#!/compare/1591747200/1591833600

item history - https://backpack.tf/item/6476828782

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Thanks Beaser!

The sale from march is still valid, 1 day early to becoming 3 months

$40 / $1.69 = 23.67 keys

20 keys

https://backpack.tf/profiles/76561198928421771#!/compare/1587772800/1587859200

The sale you linked was an 18 key sale

This makes the range to be 18 - 24 keys