Shelby Company | Custom Packaging | Folding Cartons | Retail … The Shelby Company is a leading manufacturer of folding cartons, sleeves, blister cards, posters, counter displays and various other types of specialized packaging. We have been in business since 1923 The Shelby Company is a leading manufacturer of folding cartons, sleeves, blister cards, posters, counter displays and various other types of specialized packaging. We have been in business since 1923, proudly serving our customers, providing quality packaging, excellent service and innovative solutions to our customers’ packaging needs.