TA lost my exam but has the grade for me. What to do?

Hi,

The TA of the Political science course lost my midterm but has the grade for me. He told me he is trying his best to find my paper. He also told me he would seek advise from the professor if he could not find my paper since they did not make copies of all exams.

What should I do if he did lose my paper? What if I want the professor to review my grade but now could not because of the lost paper?