In your situation, since you have already graduated, you have several options.
a) you can go back to your undergrad, have your premed interview, have your recs sent there (1 from each recommendor) and then the premed board will write a composite letter and distribute it to the schools for you, along wioth copies of the original letters. Also, btw, if you are a Cali resident, unless you have really good stats, you may want to apply to more schools. Please do a search for this type of situation and you'll see that Cali residents often apply to 20-30 schools, but of course it's up to you.
back to the topic:
b) If you live far from your undergrad and the board won't write you a letter, you can have your individual recommendors write your letters. You can give them the postage and envelopes etc, but have them seal them and give them to you...with your waived signiture form on the inside. Have them print out 10 copies, or 1 for each secondary---make sure YOU provide the shipping materials. Anyway, you can hold on to them and send them off as needed. This would help you ensure that everything has been taken care of, and you won't need to worry about if the letters were sent.
If you are unable to get a premed board letter, you will have to explain why not on your secondary applications.
hope this isn't too confusing!
p.s. In response to your last question, I had 6 letters: 2 from science profs, 1 from each non-science major, and 2 from internships