Possible Clues:

• Bill: Abbr.
• Bill of sale (Abbr.)
• Bill for mdse
• Patent holder, often: abbr
• Bill for svc. rendered
• Paper that might say COD
• Stock or bond: Abbr.
• Storekeeper's stock: Abbr.
• Storekeeper's stock (Abbr.)
• Bookkeeper's mailing: Abbr.