US Postal Service interview questions

I applied for the 473 Exam about a month ago and passed, I believe passing is a score of 70. Anyhow, I received an email from USPS 3 weeks later stating they would like to interview me for possible employment as a CCA; a position I applied for earlier! Prior to interview, they also sent me for urine test and had a background check performed. The interview was performed a few days later. Me and and about 29 other candidates showed up in a classroom like setting. The instructors stated the duties and wages of CCA, and what is expected from us. After giving out each of our pre filled applications the interviews began. Interviews are pretty simple, and have standard questions with some USPS situations. Interviewer was helpful, and beforehand told me this is easy and not to be nervous! After interview was over, followed up with head instuctor to see if all paperwork is in order while asking why should I be hired? After answering, instructor informed me to check email and spam for their answer. Also said might take few weeks, due to enourmous volume of applicants!