Send us your Business 1099 Vendor files and let us append EIN & TIN, crunch and process your data and do all the crunching & matching for you. Add extra fields if required such as: URL, Execs, Contacts, Federal Tax Liens, Phone, Fax, Sales, Ticker, Description, Keywords, SIC, NAICS code and more Uline stocks over 37,500 shipping boxes, packing materials, warehouse supplies, material handling and more. Same day shipping for cardboard boxes, plastic bags, janitorial, retail and shipping supplies. There are various ways to look up a vendor: If you already know the 10-digit vendor ID (with all the zeros), enter it in the "Vendor ID" field. If you know the Tax ID Number (TIN), enter it in the "Taxpayer Identification Number" field. If you want to search by the name of the company, continue below.