The DME documents always come in a separate mailing. If I'm not mistaken, I usually get my resort package documents before my DME documents. However I usually pay off my trip well before the 45 day deadline which could be the reason I get my resort documents first. DME always waits until about 3 weeks before your trip to send the vouchers and tags. I'd call WDW CRO and ask about your package documents. I'm assuming you are within a few weeks of your trip since you've already received the DME info.