Flchuck,
You will learn more about how the letters were mailed and how they were handled by postal services in and around Hamilton if Sarah bothers assisting you.
In the meantime, surely you can pursue other lines of inquiry. And also ponder why anyone would choose to delay these notification letters.
Yes, I have been contributing to cc for many years. Take it or leave it, as you will. The rest of my business is my business. You will get the hang of the forum when you have a bit more experience- or at least I hope so. Hint: fewer words in quotes might get you further.
Good luck with your college search!