I read fromin the dragonomiconDraconomicon that it is a common practice, at least in D&D 3.5e, for dragons to swallow their plundered loot and then regurgitate it at their lair. This would be akin to birds swalling a worm only to bring it back to their nest to feed their babies. However, it is just as common, if not moreso for the dragons to "convince" the remaining people that it is in their interest to carry large sums of their treasure over to the dragon's lair.
WotC has published some things that can only be considered canon in recent D&D, if at all
SevenSidedDie
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