https://backpack.tf/suggestion/5d2163ffd3817273cb6c9ca6

Resuggestion from here

https://marketplace.tf/items/tf2/15002;15;u702;w3;pk11;kt-2

June 20, 2019 sold for $77.78 / 1.81 = 43 keys

https://marketplace.tf/items/tf2/15002;15;u702;w3;pk11;kt-1

June 19, 2019 sold for $60.00 / 1.85 = 32 keys

https://backpack.tf/profiles/76561198040186479#!/compare/1559088000/1559174400

https://gyazo.com/8134c4a96324a62e81695fcde6953184

31 keys + 1 key sweet

https://backpack.tf/profiles/76561198290698621#!/compare/1558310400/1558483200

https://backpack.tf/profiles/76561198000326258#!/compare/1558396800/1558483200

Starstorm Slumber Vive la France

[[

Vive France Mini, thanks to K1ng

https://marketplace.tf/items/tf2/30422;5;u110 https://gyazo.com/f5d64043a471db091b828e1d859c1fed

Sold for $89.99, capped at 45 key buyout

https://backpack.tf/profiles/76561198267189538#!/compare/1563840000/1563926400

https://backpack.tf/profiles/76561198035463839#!/compare/1563494400/1564099200

Neutron Norsemann + keys (unknown amount, buyout was 37 keys)

https://gyazo.com/f5d64043a471db091b828e1d859c1fed

]]

Starstorm Vive would be approximately 41 keys, which fits into the range of the two marketplace sales.