there are a few sneaky ways to unmask them. One trick is to look at recall information. When a product is recalled or flagged by the Food and Drug Administration or United States Department of Agriculture, the product manufacturers generally publish all the stores and brand labels under which that item is sold.
Eater used Freedom of Information Act requests to obtain FDA and USDA recalls and alerts that mentioned Trader Joe’s in the last 10 years. The requests revealed dozens of companies that have, at least at one point, supplied Trader Joe’s with food.