The average banker's box -- usually the type used for documents -- holds perhaps 3000 documents. At 11 inches long each, that's somewhere around 2700 feet worth of documents. Roughly half a mile. So a trail of documents 7 miles long is going to be about 14-15 boxes. Nothing close to 489,000 boxes, or even 48,000 boxes. Or even 48 boxes.
Far more likely is that its not 48k boxes of documents, but rather 48,000 actual documents. At 11 inches per document, that's about 44,000 feet of documents, or somewhere over 8 miles of docs. Figure that some of them may be memo-sized rather than 8.5 X 11, and there's your 7 miles.
I think you may have been measuring wrong.
If you took each box side to side at 10" wide (not end to end) you would get approx. 6,336 boxes to the mile. Divide 48,000 by 6,336 gives you over 7.5 miles of boxes side by side.
There is probably no more than 1,000 pages per box which would give us a total of 48,000,000 pages.
If you had 50 people translating 24/7 with a typed translation taking 30 minutes per page it would take 1,000,000 days or 2740 years to translate all of the material.
This could be one reason that this is to be released on the internet.