@alex bo balex, I also had the same problem with USC. it has delayed my application process.The place is unorganized (admissions), as past people have mentioned. I did finally get someone to pull out my file and look through every item I turned in and they discovered the missing transcripts had been misplaced.the msw department has been extremely helpful with helping me out with this issue and processing my application for review.
Don't become discouraged by this experience, USC is a great school and has a good program. I would stry to speak to a supervisor in the admissions office that's what I did and they found my transcripts.
Good luck!