Plants vs. Zombies

https://backpack.tf/item/2111729258

Sale 1) Sold for $99.99 when Keys were ~$1.84 each

https://backpack.tf/profiles/76561198035302444#!/compare/1561075200/1561939200

https://marketplace.tf/items/tf2/435;5;u13

https://marketplace.tf/items/tf2/5021;6

99.99 / 1.84 = 54.34, which rounds to 54 Keys

https://backpack.tf/item/1678956542

Sale 2) Sold for a Scorching Flames Head Hedge (42 Keys)

https://backpack.tf/profiles/76561198006544512#!/compare/1560556800/1560643200

https://backpack.tf/profiles/76561198095589372#!/compare/1560556800/1560643200

Hedge Mini

https://backpack.tf/profiles/76561198264117106#!/compare/1563235200/1563321600 - Sold for 35 Keys

https://backpack.tf/profiles/76561198125791160#!/compare/1565740800/1565827200 - Sold for 28 Keys + Starstorm Slumber Nasty Norsemann (20 Keys)

https://imgur.com/a/WeXWFtX - The Norsemann sale is capped by the Buyout of 45 Keys

https://backpack.tf/profiles/76561198090123523#!/compare/1559520000/1559606400 - Sold for 40 Keys + 13 Refined

https://backpack.tf/profiles/76561198119634686#!/compare/1561248000/1561334400 - Sold for a Clairvoyance Head Hedge + 22 Keys

https://backpack.tf/profiles/76561198112397295#!/compare/1564876800/1565308800 - Sold for 39 Keys

https://marketplace.tf/items/tf2/30978;5;u14 - Sales at from 39, 44, and 48 Keys (not including the 2 $61 sales)

https://backpack.tf/profiles/76561198306288794#!/compare/1563062400/1563148800 - Sold for 39 Keys

Considering 40 Keys + 13 Refined was to a buy order, I'm calling 35 Keys low. Also calling 48 high. Taking 39 - 45, which averages to 42 Keys.

Sale 3) ?

https://backpack.tf/profiles/76561198095589372#!/compare/1561593600/1561680000

https://backpack.tf/profiles/76561198224648164#!/compare/1561507200/1561680000

Sale 4) Sold + Circling TF Logo Kiss King for a Haunted Ghosts Vive la France + 5 Keys

https://backpack.tf/profiles/76561198224648164#!/compare/1562112000/1562198400

Using for the Vive.

Sale 5) Sold for 50 Keys

https://backpack.tf/profiles/76561198055622215#!/compare/1564444800/1564531200