https://backpack.tf/item/8339926140

5 keys:

https://backpack.tf/profiles/76561198125791160#!/compare/1705795200/1705881600

https://backpack.tf/profiles/76561198170813939#!/compare/1705881600/1705968000

https://backpack.tf/item/10782956414

Dumped to a bot for ~4.5 keys:

https://backpack.tf/profiles/76561198310051697#!/compare/1708560000/1708732800

https://backpack.tf/profiles/76561199059160806#!/compare/1708646400/1708732800

6 keys:

https://backpack.tf/profiles/76561199059160806#!/compare/1708819200/1708905600

https://backpack.tf/profiles/76561199401111273#!/compare/1708473600/1710460800

https://backpack.tf/item/10764962615

2 keys match:

https://backpack.tf/profiles/76561198311498888#!/compare/1708387200/1708473600

https://backpack.tf/profiles/76561198168578115#!/compare/1708387200/1708473600

STN's buyout is currently at 5 keys 27.55 ref so should fall in-range regardless https://stntrading.eu/search?products%5Bquery%5D=Magic%20Shuffle%20Taunt%3A%20Runner%27s%20Rhythm

Sold alongside 28 keys for the Ring of Fire Murderer's Motif (bulk):

https://backpack.tf/profiles/76561198168578115#!/compare/1708732800/1708992000

https://backpack.tf/profiles/76561198231709968#!/compare/1708905600/1708992000

Untrace but bot dump:

https://backpack.tf/profiles/76561198231709968#!/compare/1709251200/1709337600

https://backpack.tf/profiles/76561199072654974#!/compare/1709251200/1709337600

3 keys match in seller's compare, 6 match in buyer's one:

https://backpack.tf/profiles/76561199072654974#!/compare/1709942400/1710028800

https://backpack.tf/profiles/76561198219049900#!/compare/1710028800/1710115200

Taking 6 here

https://backpack.tf/item/10805416254

Looks like a backpack purchase:

https://backpack.tf/profiles/76561198317244981#!/compare/1707868800/1707955200

https://backpack.tf/profiles/76561198057412106#!/compare/1707868800/1707955200

Buyer listed it on MTF

Going with 5-6 keys since 4.5 was a dump