That outpost trade was closed 6 months ago, he might have changed his buyout since then.

Yeah, using the B/O here wouldn't be fine. The thing is, it resold twice for way lower:

~137 keys in mixed pure/sweets

https://backpack.tf/profiles/76561198059042690#!/compare/1491350400/1491436800

70+ keys pure. Some keys were used to buy other unusuals

https://backpack.tf/profiles/76561198220101208#!/compare/1491350400/1491436800

http://www.tf2outpost.com/trade/28852592 ----- B/O was 150, sold quickly

???. Casemaker probably went to a private inventory.

https://backpack.tf/profiles/76561198086948995#!/compare/1492732800/1492819200

The one who paid 270 relisted for 150 a few days after buying it. I talked with polar, and it's better to leave this outdated.