Only one of these has been traded recently

https://backpack.tf/item/1657071205 <- had 2 sales, but the other was off-site

Only trackable sale was for demonflame flamboyant(175 keys)+this for 671 pure

https://backpack.tf/profiles/76561198056866244#!/compare/1565913600/1566000000

Since flamboyant was recently priced (3 months ago), I'm assuming the price is accurate, essentially making this a sale for 496 pure.

Through bp.tf rounding, that makes this misc worth 500 keys (which makes sense based on the prices of other effects).