Their papers and documents, some 20,000 boxes worth, are stuck in a storage facility in Linden, N.J.
The paperwork relating to the Avery case is all stored in boxes in a storage unit. 
mnli hypothesis: The paperwork relating to the Avery case is all stored in boxes in a storage unit.  premise: Their papers and documents, some 20,000 boxes worth, are stuck in a storage facility in Linden, N.J.