A Michigan-based meat company recalled more than 1,000 pounds of fully cooked ground beef after a customer reported finding pieces of metal in the product, it said in a release. Ada Valley Meat Company on Tuesday said recalled products were shipped to businesses and distributors across five states: California, Delaware, Illinois, Michigan and Pennsylvania. The affected items came in 20-pound boxes containing four 5-pound bags of "Ada Valley Fully Cooked Ground Beef" from specific lots -- pack date May 28 with lot code 35156 and pack date May 30 with lot code 35157 -- the company said. The products subject to recall also bear establishment number "EST. 10031" inside the U.S. Department of Agriculture (USDA) mark of inspection, it said. While no injuries have been reported, food safety officials are concerned that some of the recalled products might still be in institutional freezers, Ada Valley noted. "We are taking this step out of an abundance of caution and in line with our core value: the safety and trust of our customers come first," Gerrit Rozeboom, the company's president, said in a statement sent to ABC News. MORE: High Noon voluntarily recalls some vodka seltzer drinks that were mislabeled as Celsius energy drinks The USDA Food Safety and Inspection Service advised institutions not to serve these products and instead throw them away or return them to where they were purchased. "We are working closely with regulators to investigate the issue and have already implemented additional safety measures and quality checks to prevent future occurrences," Rozeboom told ABC News. Customers with questions about the recall can contact the USDA Meat and Poultry Hotline at 888-674-6854 or email MPHotline@usda.gov.