Previous suggestion was 2 weeks before the crate bug deppression. These unusuals went from 12 to 30 in circulation...

MP sales

https://marketplace.tf/items/tf2/30422;5;u57

1 sale at $44, 2 at $50, making a range of 24 - 28 keys

Unsuccessfull auction proving that $50 isn't a QS https://i.imgur.com/uzI2c9C.png https://i.imgur.com/e9mO8MM.png

Non-usable sales

https://backpack.tf/item/7957110074 & https://backpack.tf/item/7956765808 & https://backpack.tf/item/7956485460

All are a succession of BS and QS, couldn't find any usable compare link except these followings :

https://backpack.tf/profiles/76561198347512459#!/compare/1568073600/1568246400 16.5 k (= quickbuyers)

https://backpack.tf/item/7957110074 quickbought for 16.3 by zol ( https://i.imgur.com/XM3DS05.png google cache screenshot)

https://backpack.tf/profiles/76561198169444473#!/compare/1568419200/1568505600 -> 33k, feels like an outlier, excluding (sellers at 28 and 30 in classies)

Sold for 3 outdated unusuals + 3k of sweets :

Mini on OF Modest Scrap : Sale on MP capped by a month unsold at 15 in classies

Mini on Tiger Killer Solo : sales at $12 on MP (excluding the one at $8, below quickbuyers in classies) -> 6.5k

Mini on Screaming Soviet : 2 sellers at $14 on MP, recent sales ~$14 -> 8k

Any pertinent comments are welcome.