Credit to Beyond for the screenshots!

https://gyazo.com/30d24083c9339106cba6063a7db0b832

https://gyazo.com/4d261a95cd8393e0c4f3114d14f166b6

Item History: https://backpack.tf/item/6313117617

Sold for a Comic Constellations Gauzed Gaze (Recently priced at 620 Keys), 200 Keys and 3995 USD --- 3300 Keys

Key Mini --- 2743 Keys

https://forums.backpack.tf/topic/78488-%F0%9F%97%9D%EF%B8%8Fbuying-keys-for-161-paypal-15-for-crypto-and-tods-for-068-%E2%9C%85-100-trust/ - Buying for $1.61

https://forums.backpack.tf/topic/79967-buying-tf2-keys-paypal-161-usd-crypto-159-usdt-no-fees-on-binance-50-trust-%E2%9C%94%EF%B8%8F/ - Buying for $1.61

https://forums.backpack.tf/topic/85893-%F0%9F%8C%BBbuying-keys-162-usd-backpacks-via-paypal-%E2%9C%94%EF%B8%8F300-trust-ratings%F0%9F%8C%BB/ - Buying for $1.62

https://forums.backpack.tf/topic/78481-%F0%9F%94%B4-b-keys-162-backpacks-%F0%9F%94%B4-280-trust-ratings-%E2%9C%85/ - Buying for $1.62

Taking 1.615 as the value

3995/1.615 = ~2473 Keys

Taking 2743 Keys for the key mini

620 + 200 + 2743 = 3293 Keys = ~ 3300 Keys

Rounding to 3300 Keys

Going 3300 Keys flat!