"I hope to donate the letters soon because this year is a remarkable year -- the 60th anniversary of the atomic bombs and the end of World War II," she said.
"I think his letters are a great message from Dr Einstein to everybody in modern times as we are still struggling to reduce nuclear weapons."
The couple sent a Japanese doll and traditional pictures to Einstein while receiving in return his black-and-white photograph with his autograph.
"My husband repeatedly told me he really missed Dr Einstein after his death," Shinohara said. "He told me there were a lot of other things to discuss with Dr Einstein."
Several museums have already made requests seeking the letters for their collections, according to Yutaka Sakuma, a lawyer handling the papers.
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