the top of a box is called the top or the roof of the box . not
very hard
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The top of a box might be a lid. If there is no lid, there may
be flaps.
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The box top program provides money to schools and organizations.
Many schools have box top collection programs, and will usually get
about 10 cents per box top.
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The white push button on the top of the box.
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It is called the top of the box or it might be called the
"lid".