I am looking to identify the roofing shingles that came off my roof. I need to purchase a replacement bundle to replace the missing few shingles. They were installed the summer of 2012 in Northwest Indiana. I am leaning towards GAF timberline of some sort. The strip on the shingle says MIAMI DADE COUNTY APPROVED PX A4400 after the A4400 there seems to be another character that I cannot identify. See photos. Any help would be greatly appreciated.