(CNN) — Shortly before she and her family went into hiding, Anne Frank gave some of her toys to a crony for vigilance — a tin of marbles, a tea set and a book.

Anne had frequently played with Toosje Kupers on a streets of their Amsterdam area and tasked her crony with looking after her appreciated possessions.

The subsequent partial of a story is good famous — a Frank family’s suffocating knowledge of spending 25 months in close quarters, stealing from Jewish harm by a Nazis. The universe schooled a harrowing story in Anne’s possess words, created in her now widely review diary.

Now, some 70 years later, Frank’s colorful marbles have been rediscovered and will go on arrangement for a initial time during a World War II muster in Rotterdam.

“Anne gave these to her crony for safe-keeping,” Teresien da Silva, conduct of collections during a Anne Frank House museum, told CNN.

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“She kept them for when Anne returned, though Anne did not return.”

Kept in a box

Frank’s comment of stealing in Amsterdam during World War II, published posthumously in English as “Anne Frank: The Diary of a Young Girl,” has changed millions of readers opposite a decades.

The immature girl, with her relatives and sister Margot, had changed into a secluded unit on Jul 6, 1942 — a “Secret Annexe” on a Prinsengracht Canal. Only a tiny round of helpers knew of their whereabouts, and a family lived in fear of being discovered.

They were betrayed, arrested and deported in Aug 1944. Frank died of typhus in Bergen-Belsen usually weeks before a Nazi thoroughness stay was released in 1945.

Kupers had kept a belongings. After a fight ended, she offering a equipment to Otto Frank, Anne’s father and a usually member of a family to tarry a Holocaust. She was told she could keep them.

And she did, usually anticipating them decades after when relocating usually over a year ago.

“She detected she had a marbles somewhere during home in a attic,” da Silva said. “She immediately contacted us. … We were anxious that a marbles survived and had been kept. She motionless to give all to a Anne Frank House — a book, a tea set and a marbles.”

Treasured marbles

The Anne Frank House Museum has already displayed a book, that Frank perceived for her 13th birthday, as good as a tea set, da Silva said.

“But we motionless to benefaction a marbles for a initial time in Rotterdam,” she said.

The marbles, alongside 99 other objects, make adult a muster The Second World War in 100 Objects, that opens to a open this week. Dutch aristocrat Willem-Alexander will open a muster Tuesday.

Da Silva pronounced Frank was one of many Jewish children who gave divided their toys before going into stealing or being deported.

“For children during that time, marbles were a treasure. They worked really tough to win them,” she said.

While a marbles are old, she said, they are in good condition.