I certainly am not the GM and thus take my words with some modicum of hesitation. Assuming a target number of 10 + the guards' perception skill + wisdom bonus I would [u]assume[/u] that's a failure.

The big question is how are the guards going to react to the failed attempt :)

I'm also uncertain if one should post the attempt to hide the object before letting our GM resolve the action or if we just post the die rolls in the OOC without writing the character making the attempt. *ponders*