Resuggestion

1st sale: from STN - 98 keys

https://backpack.tf/profiles/76561199581722058#!/compare/1783123200/1783209600

https://backpack.tf/profiles/76561198066743294#!/compare/1783123200/1783209600

2nd sale: 153 keys in total: 5 unusuals (128 keys, based on their latest accepted prices) + 25 keys pure

Seller's backpack history:

https://backpack.tf/profiles/76561198066743294#!/compare/NaN/1784764800

Buyer's backpack history:

https://backpack.tf/profiles/76561199735624439#!/compare/1784764800/1784851200

https://backpack.tf/item/11577081325

https://backpack.tf/profiles/76561199131651373#!/compare/1774137600/1777507200

https://backpack.tf/profiles/76561199389274250#!/compare/1777248000/1777334400

120 keys

https://backpack.tf/profiles/76561199131651373#!/compare/1786320000/1786838400

https://backpack.tf/profiles/76561198253182905#!/compare/1785369600/1788825600

77 keys traceable

https://backpack.tf/profiles/76561199072667073#!/compare/1786752000/1786838400 - maybe 43 keys used on Moth Plague Starlight Sorcerer

= 120 keys?

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https://backpack.tf/item/14057186245

https://backpack.tf/profiles/76561198144227819#!/compare/1787011200/1787961600

https://backpack.tf/profiles/76561198017872339#!/compare/1787961600/1788048000

40 keys + Polar Prism Hat Outta Hell + Green Energy Galvanized Gibus

Likely higher than current sellers

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https://backpack.tf/item/13603934313

https://backpack.tf/profiles/76561198315558870#!/compare/1783036800/1783123200

https://backpack.tf/profiles/76561198060126263#!/compare/1783036800/1783123200

bulk

https://backpack.tf/profiles/76561198060126263#!/compare/1783123200/1783209600

https://backpack.tf/profiles/76561199581722058#!/compare/1783123200/1783209600

only metal traceable on seller's side

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https://skinport.com/tf2/item/unusual-spooky-head-bouncers+burning-flames/85089249 - seller on skinport sold

https://skinport.com/tf2/item/mann-co-supply-crate-key

key prices are less stable on skinport, so I think it would make the most sense to take a 7 day average here:

(2.57 + 2.55 + 2.55 + 2.60 + 2.49 + 2.53 + 2.50)/7 = ~CDN$2.54

CDN$220.35/$2.54 = ~87 keys

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87-120 should work