I've been going through the cards and can't find any hints as to what is inside the traveler. Was it a ship of a really advanced race like the forerunners from halo? Or does it store the best specimens from the races it has tried to protect so far? Any other theories someone might have???
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Its because you're looking in the wrong place. If you read the flavor text on the Traveler Mask, you'll find that the Traveler is full of vanilla ice cream.