Help Locating O RingPressure Release in Tradecraft Case

[Gonzoshots]

SO where exactly is the elusive air release valve/o-ring I read about, apparently I need to remove an o ring so it will equilibrate during air travel... please help i leave i the morning! PS its a Tradecraft case for the Phantom 2, think its called an XR.

 

[goldfishrock]

Aren't the valves those little holes just behind the locking lugs?

 

[Insight Aerials]

Didn't think they had air valves. If I remember correctly, you remove the rubber seal around the opening of the case.