Sale 1: ~19 keys.

Sold For Strange Specialized Killstreak Australium Minigun. B/O Cap 19, https://bot.tf/stats/listings/4EGN356M

https://backpack.tf/profiles/76561198086948995#!/compare/1553990400/1554076800

https://backpack.tf/profiles/76561198178171621#!/compare/1553990400/1554076800

Sale 1: Untrace. (SCM)

https://backpack.tf/profiles/76561198153426662#!/compare/1549584000/1557273600

https://backpack.tf/profiles/76561198413125750#!/compare/1557273600/1557360000

Sale 2:

Sold For Strange Professional Killstreak Uranium Tomislav (Minimal Wear) (no Usable Mini)

https://backpack.tf/profiles/76561198413125750#!/compare/1557792000/1557964800

https://backpack.tf/profiles/76561198279609240#!/compare/1557878400/1557964800

Sale 3: Untrace.

https://backpack.tf/profiles/76561198279609240#!/compare/1557964800/1558051200

https://backpack.tf/profiles/76561198144945119#!/compare/1557964800/1558051200

https://marketplace.tf/items/30866;5;u30

Sale 4: ~20 Keys.

Mar 30

$36.00 / $1.79 = 20.11 keys

Sellers at 17 and 18 keys - https://gyazo.com/71e5487647dbef951d9d0d37b1e79e0d - https://gyazo.com/994bdde93716150950176078e9b35794

Going with 17-20 keys.

Thanks to scourge for the premium and shuffle for the help!