Original W-2 reported CA SDI amount in Box 14, now W-2C Box 14 is blank - can I report correct CASDI anyway?

My employer issued a corrected W-2 that left off CA SDI (Box 14 was blank), whereas before they had reported an amount in the original W-2 Box 14. I questioned them about this and they provided me an updated CA SDI amount via email that matched the corrected wages from W-2C, but told me they won't issue another W-2C since Box 14 is voluntary information.

 

I was told I can just enter the amount they told me into my return on Schedule A without it being on the W-2C.

 

Is this correct? Since I qualify for and take itemized deductions, I'm concerned that I'm at risk of being flagged for reporting an amount that isn't shown in Box 14 on the W-2C. The difference in original Box 14  W-2 CA SDI and the W-2C CA SDI is more than $1000. They provided me pay registers and stubs that confirm the amount they emailed me, so I have supporting documentation in the event of an audit, but would like to avoid an audit in the first place.