@milimelo Sorry for the delay, I ended up waiting a little longer to go to CBP then originally plan.
The CBP agents were very friendly and willing to help. They looked up my husband's I-94 record but couldn't find anything wrong with it. They did say that they weren't able to see the K-1 documents at the time of entry and that those docs would be with USCIS.
So, it appears the next step is to try and get an appointment with the local USCIS field office and see if they will go over the I-485 and K-1 entry docs ? (We never received EAD or AP as the green card came quickly, although we did apply.)
Also, the manual verification finally went through and husband's immigration status was verified. It took just short of 2 months. Side note: after 6 weeks of waiting, I called the SAVE number and, after a hour wait time, I got someone on the phone. However, they wouldn't talk to me, they would only talk to the agency (in this case DMV). The only thing they would tell me is that, on average, it is taking longer than 6 weeks for manual (2nd step) verification.
Not sure how helpful it is, but I also found this fact sheet from USCIS on how to work toward correcting records in SAVE: https://www.uscis.gov/sites/default/files/document/fact-sheets/SAVERecordsFastFactsforBenefitApplicants.pdf Interestingly, they don't mention the I-485 as a document that can be corrected.