AHA doesn't list the 7777 bull as a DL carrier but most everyone knows that he was. How'd you know that he was?
The secret decoder ring/access is............do the research and check with fellow breeders and the breeder that bred the animal(s) and breeders that now own the cattle. Ask a lot of questions.
Some animals do get tested early on to help "prove" the test, including "suspect carriers", "unknowns" and "known non-carriers". Breeders asked to submit DNA early in the research process help prove the test. So, if a breed association or a researcher calls you to ask for DNA to help develop a test, it is in the breeders best interest to provide the DNA.
Also, because AHA recognizes only testing done at Maxxum Analytics, some of those early tested animals may, or may not, get official recognition. Lastly, I invite you to read (re-read) the November 2008 Performance Matters column in the Hereford World. Under the "AHA testing & disclosure procedures", pay attention to item #8.
http://www.herefordworld.org/_HW/Documents/1108_PerfMatters.pdf