How do you do the Bento Boxes in Nancy Drew: Shadow at the Water's Edge?

I have been working on this forever! I can't seem to figure out these boxes. I've read the instructions carefully and I still don't get it. I don't have the slightest clue how to do these bento boxes. What's the purpose of these?How do you do the Bento Boxes in Nancy Drew: Shadow at the Water's Edge?
Here's a link to Nancy Drew walkthroughs. The solution is there. I have a bookmark on this page.

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