I did a search and this is the closest I could find:
".....the California Raisin Marketing Board in Fresno, CA mailed a four-recipe pie brochure (Classic California Raisin Pie, Dutch Apple California Raisin Pie, The Best-ever California Raisin Sour Cream Pie....."
Even though it's not a Baker's Square recipe, it sounds like it may be even better than Baker's Square's !
Who knows -- the CRMB may have an "in" with Baker's Square. In any case, I'd email them and ask for their recipe, and also ask if they have access to the Baker's Square recipe you are looking for.