After being pointed out the floor value was flawed, suggesting the correct price to validate at 7.5 keys

Sold the steaming furious fukaamigasa for yeti smash taunt effect: good hearted goodies (worth 3.8 keys) + 3 keys + 20 ref

Proof for trade: https://imgur.com/SsaURsV

Proof for sale of the yeti taunt: https://imgur.com/gmz6wYD

Other buy orders starting at 6.36 keys

Sell orders starting at 7.48 keys

https://backpack.tf/classifieds?item=Furious%20Fukaamigasa&quality=5&tradable=1&craftable=1&australium=-1&particle=36&killstreak_tier=0

The median price on marketplace.tf has been near $15, if you average keys at $2-$2.13 of sale that is 7.5 keys

https://marketplace.tf/items/tf2/395;5;u36

More reddit based sale on /tf2trade

https://www.reddit.com/r/tf2trade/comments/knghqs/hsteaming_furious_fukaamigasa_w_7_keys_and_40/

stntrading bot buying for 6 key 26 ref and selling for 7 key 39 ref

https://stntrading.eu/item/tf2/Unusual+Steaming+Furious+Fukaamigasa