Resuggestion from https://backpack.tf/suggestion/5fd51c2d9bfd1d039972a24e

https://backpack.tf/profiles/76561198045946862#!/compare/1600905600/1601164800

https://backpack.tf/profiles/76561198255764866#!/compare/1601078400/1601164800

46 keys

https://backpack.tf/profiles/76561198255764866#!/compare/1601078400/1601164800

https://backpack.tf/profiles/76561198157452762#!/compare/1601078400/1601164800

57 keys

https://backpack.tf/item/1649420593

https://marketplace.tf/items/tf2/30038;5;u69

$199.99 / $1.77 = 112.99 keys

Proof by https://backpack.tf/u/76561198085880346

https://backpack.tf/profiles/76561198044719739#!/compare/1605744000/1605830400 - Bulk

https://cdn.discordapp.com/attachments/516827733314240517/796976042988404796/unknown.png - 69 Keys

The 113 buyer resold the Firewall in a bulk deal as well

https://steamuserimages-a.akamaihd.net/ugc/1662358261259207914/32AC6454EA997AB4783A1E7D662ADA6BE662B0C7/

For perspective, the Bonk sold for ~140 Keys to a buy order here

https://backpack.tf/profiles/76561198271915998#!/compare/1605657600/1606003200 - 19 Keys here

https://backpack.tf/profiles/76561198795826430#!/compare/1605916800/1606003200 - 22 were used for the Sticky + 28 were used for the Grenade

https://backpack.tf/profiles/76561198985755375#!/compare/1605916800/1606003200 - 21 were used for the Knife

and ~50 were used for the Medi Gun, but I can't trace those

The Bonk also sold for 200 Keys here

https://backpack.tf/profiles/76561198056086416#!/compare/1603497600/1603584000

https://backpack.tf/profiles/76561198902479382#!/compare/1603324800/1603843200 - 34 of the 59 for the Hotrod

https://backpack.tf/profiles/76561198202135278#!/compare/1603584000/1603756800 - Other 25 of the 59 were used for the Smokey

https://backpack.tf/profiles/76561198135388328#!/compare/1603497600/1603584000 - 26 for the Birdcage

https://backpack.tf/profiles/76561198199613277#!/compare/1601942400/1603584000 - 77 for the Dragonborn

https://cdn.discordapp.com/attachments/146449414360268801/796878595598975006/firewall.PNG - New seller at 100

With that, 113 will be too high, so 69 flat will work.

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Going with just 69