Leaving Brazil without entry form

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When arriving to Brazil, I had to fill the customs declaration and entry form. The entry form then was stamped and returned to me. I was told, that this piece of paper is very important and that I need to return it when I leave the country.
What would happen, if I didn't have the form when leaving Brazil? For example in case I lost it or if they forgot to give me the form when I enter?
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Images: Willian Luiz, Dayvison de Oliveira Silva, ROMAN ODINTSOV, Marian Sol Miranda