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There have been a number of posts on here regarding very high limit credit cards (>25k) as not reporting limits. My recollection is that these were posted by nyccc2 and some others (do a search on high limit credit cards).
There are also a very large number of posts on the signature cards with no preset limit. Some of these report a limit and some do not. So unfortunately, I believe the answer to your question is that the cc are not required to report the limit. Of course, your folks could call their ccc and see if they will report.
Cheers
Truth be told, no CCC is required to report your CL. Or balance. Or anything else for that matter. Legally they could report nothing, as if you didn't even have an account... if they wanted to. The legal requirement is that if they DO report something, it must be accurate.