Amazon.com : AMBOR File Box with Lock, Fireproof Document Box with 5 Tabs, Collapsible File Organizer with Handle for Letter & Legal Size Folder/Certifications/Books Storage, Black : Office Products
Document Box Styles | Archival Boxes for Documents
Why not just use Box as a document management system?
The Hollinger Box - Special Sizes
Pratt Retail Specialties 15 in. L x 10 in. W x 12 in. D Document Box 3-Pack DOCBOX3PK - The Home Depot