About a week ago, I decided to rewatch Markiplier's Five Night at Freddy's playlist of all three games. I got through the first game but on the second game, I stopped a few minutes in because of why Phone Guy said, "Welcome to your new summer job at Freddy Fazbear's Pizza."
Summer job? The check at the end of Night 5 says November, unless each night represents a month. If so, Jeremy is witnessing Fazbear's fall from July to November, those praises from Phone Guy for making it through another night are praises for making it through another month.
I then remembered that the check also said "Welcome to the Family" but what if they are welcoming you to the day shift, the family everyone else knows?