https://backpack.tf/profiles/76561198104628963#!/compare/1550102400/1552089600

https://backpack.tf/profiles/76561198061489334#!/compare/1552003200/1552089600

Sold for 34 keys

https://backpack.tf/profiles/76561198061489334#!/compare/1552003200/1552089600

https://backpack.tf/profiles/76561198128956778#!/compare/1549584000/1555200000 - Can't find it in this compare

In one of the compare links above, a different one was also sold for 50 keys.

https://marketplace.tf/items/30420;5;u16

March 18, 2019 sold for $70.00 / 1.79 = 39 keys

https://bot.tf/stats/item?def=30420&q=5&ef=Vivid+Plasma&craft=1&aus=0&ks=0

https://gyazo.com/47dc1f372f8f22f49ec49ffc738e3912

https://backpack.tf/profiles/76561198273587592#!/compare/1549065600/1549497600

https://backpack.tf/profiles/76561198312583107#!/compare/1549324800/1549411200

Sold for 38 keys from a bot

https://backpack.tf/item/5555065145

Sold to a reseller where it is currently for sale at 43 keys. I can't find it in any compare links...

https://backpack.tf/profiles/76561198135264771#!/compare/1552262400/1552521600

https://backpack.tf/profiles/76561198080179568#!/compare/1552435200/1552608000

https://backpack.tf/profiles/76561198104628963#!/compare/1546300800/1550102400

https://backpack.tf/profiles/76561198273587592#!/compare/1549929600/1550102400

Clairvoyance Trucker's Topper minus 2 keys

https://backpack.tf/suggestion/5cbb3475d381725b4f7dc6a0

45 keys for Trucker's Topper, making this sale 43 keys.

Classifieds

https://gyazo.com/146dd26008beff60b08295c3e7db0be2

https://backpack.tf/stats/Unusual/Danger/Tradable/Craftable/16

43 keys for 25 days

50 key for 17 days

Buyers at 31 keys

34 is pretty close to buyers, going with 38-43.