We file electronically and any blank boxes (i.e. date of birth), we will receive an "acknowledgment error", meaning the CTR filed has been acknowledged but there is an error on the CTR. If we have missing info and are going to file anyway (such as filing without a date of birth) we complete the fill in version on FinCEN's website and then type in (using a typewriter) "not available" in the date of birth box and mail in the form. We haven't had the fill-in CTR's returned when there's at least something typed in the box to reflect the date of birth isn't available (but on the electronic CTR, the field only accepts numbers).
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CAMS
CAFP