Item Exterior Glitch?

[Volvo2v1]

Hello guys.
Can anyone explain this to me?
This guy has AWP Boom in his inventory. As you can see it's Factory New. But actually it's Minimal Wear. You can see true exterior in trade offer window..
How did he do that ?

His inventory:
/profiles/76561198274704674/inventory/

His trade url:
/tradeoffer/new/?partner=314437945&token=4VpUFUhz

[Add steamcommunity[DOT]com before slash.
Can't post links sorry]

[-fbN]

This tradeoffer-Link is just the offer links for this account: /profiles/76561198274703673/inventory/ he is just trolling

[Volvo2v1]

Aha, ty I didn't notice that.

[minereaper]

That was a really nice troll Lel