https://marketplace.tf/items/628;5;u72

April 2, 2019 sold for $85.00 / 1.79 = 47 keys

This sale is quite close to buyers, and judging by the item's history, the seller had a hard time selling it and might have ended up dumping it for low.

https://gyazo.com/fe056973a1d7b038c1aa78c549422ae9

https://backpack.tf/item/1694706561

https://backpack.tf/profiles/76561198011321852#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561197966333170#!/compare/1554163200/1554595200

Sold for Purple Energy Virtual Reality Headset + 20 keys

PE VRH has an open suggestion for 38 keys. This makes this sale 58 keys.

https://backpack.tf/suggestion/5c7953b867807224703e0f7b

Previous closed suggestion showed it even sold for ~65 keys.