Any of the company who offers job to anybody, at very first they are being checked the background of that candidate so don't worry about that what will happen next becasue your background had been already checked by the company before they offer you a job. So if any of the delay in confirming the mail regarding you joining then there may be some other reason for that.I'm in the process of being hired by apple and I was wondering when they do the background check. I was already offered the job, so does that mean they already did it? Do they do it after they offer the job? I'm so confused...