The store found letters he wrote during World War II.
Two letters were found inside a box donated to the Bellevue Goodwill store over Labor Day weekend.
The letters were written by Navy Seaman Robert Ballantine to a woman in Bristol, Pennsylvania. He mailed the first one from the Great Lakes Naval Training Station near North Chicago.
The second was written at sea.
The people at Goodwill discovered Ballantine's ship was part of the D-Day operation in Europe.
They hope to track down his next-of-kin so they can return his letters to them.