A box of customers' opinions

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hplv1561w

Member
Việt Nam
Hello,
May I ask the English word for "a box which customers' opinions go into?
We usually see that kind of boxes at school, in a company, or at a State agency.
Opinions can be something we don't agree with, or something we say to make it better.
I'm thinking of "Comment Box", "Complaint Box" or "Improvement Box".
I'm not sure which word people normally use.
Thanks.
 
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