In my humble opinion, if he already got the polio vaccine, already went to the civil surgeon to have the vaccine assessment part of the I-693 done and you are just waiting for the sealed envelope and they said you'll have it in 2 weeks, then I would wait for the report from the civil surgeon and send it with the I-485. USCIS is not giving out RFEs for the missing polio vaccine until you get to the interview stage. If you don't have the vaccine assessment done with it added by that time they give an RFE after the interview. However, waiting the extra two weeks now and sending it with the I-485 will save you from having to deal with it at the interview. So to sum up, if I were in your position I would wait for the sealed envelope before filing and send it in with the I-485. Also, still send a copy of the DS-3025 because that will remind them to look for the full overseas medical report to put with your file.