John Klima writes in with another story description looking for a title.

Do any of our readers out there know the title of this story?

I need help finding the title and author of a science fiction story. The basic plot goes like this: A guy finds a graffiti-covered box (looks like a telephone box or a power box) in the woods and realizes it is a puzzle. He opens layer after layer of the box to find harder puzzles that involve high math and even chemistry. He eventually is stymied and gives up. Turns out the box is an alien test to see if we are ready for first contact.

Can you name this story?

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