TEST WENT MISSING! FREAKING OUT

Hi everyone. i was wondering if you could help me with an issue i’m having that’s freaking me out. the other day, i did a midterm for one of my classes that consisted entirely of multiple choice answers. An exam booklet was given to us with all the questions, and we answered them on a scantron. (we were not required to write on the exam) I turned in BOTH the exam and booklet to my TA upon completion, and i wrote my name on both. The next day, my TA pulled me aside and told me that my booklet with the multiple choice questions had gone missing, BUT they did have my scantron. Seeing how distraught i was, he assured me that i wasn’t in any sort of trouble, and that they simply wanted to figure out what had happened to the exam. he told me he would contact me, but i haven’t heard from him since. i’m freaking the hell out. can someone who’s been in a similar situation help me out and give me advice on what to do?!! thanks a bunch. (sorry for the long read)