Never priced.

Credit in part to https://backpack.tf/suggestion/5feabf060f65ec0b5801ef42​.

Sale 1:

https://backpack.tf/profiles/76561198342161127#!/compare/1604534400/1604620800

74 keys, credit to Shuffle Spy.

Sale 2:

https://backpack.tf/profiles/76561198097499917#!/compare/1604793600/1605052800

Sold for a Morning Glory Firewall Helmet + 20 Keys, credit to Shuffle Spy.

45+20=65 keys.

Sale 3:

https://backpack.tf/profiles/76561198072355915#!/compare/1606003200/1606089600

Sold for a Blizzardy Storm Boxcar Bomber + 3 Keys, credit to Shuffle Spy.

53+3=56 keys.

Mini for Blizzardy Storm Boxcar Bomber:

https://backpack.tf/suggestion/5ff8c3e963ee59191d01598d

53 keys.

Sale 4:

https://marketplace.tf/items/tf2/30743;5;u132

Nov 27, 2020: $119.99

$119.99 / $1.76 = 68.18 keys

68 keys.

Sale 5:

https://backpack.tf/item/6462222215

https://imgur.com/0t3yPSD (credit to Kraaaaaazy)

https://backpack.tf/profiles/76561198221421520#!/compare/1607817600/1609200000

https://backpack.tf/profiles/76561198041513103#!/compare/1609113600/1609200000

Sold for Terror-Watt Patriot Peak + 44 keys.

43+44=87 keys.

Mini for Terror-Watt Patriot Peak:

https://backpack.tf/suggestion/600158d1768299685b4c552e

43 keys.

Conclusion:

After all that effort to mini the Terror-Watt Patriot Peak for this suggestion, I'm going to exclude it. 87 keys is 12 keys higher than a current seller, so regardless of your opinions on whether sellers should counter unusual suggestions, this one just feels too high. Further, 56-87 is much too wide. https://gyazo.com/fba6c5163f71e2715d3c3798d03fadbc

Going with a range of 56-74 keys.