We typically hang the halves for 21 days - which I would consider "dry" aging from the start. In a commercial setting, I would agree that most if not all meat is fabbed and packed prior to "dry" aging in house such as yours. A lot of traditional ranch raised butcher beef was dry cured by default and although there was a lot of shrink, the end result was phenomenal considering the animals that were typically harvested.
In this case, I'm almost certain that both animals would have graded prime, if not they would have just missed. Small frame Angus weighing around 1300 live, don't remember the carcass weight and didn't see them myself to inspect any of the drop but there is a lot of marbling and the backfat is pretty insane.
Need to go dig up the old Tatum and Smith class notes and do a little grading as we pull them out of the freezer.