I wish that I could tell you from direct personal experience, but I have read several posts that say that the BofA signature cards do report, in contrast to those from Chase and elsewhere. Have you tried doing a search here? Of course, it doesn't help that it might be under BOA, BofA, and Bank of America. Maybe signature card would get you started.
I can't remember for sure who I think has these, but a lot of familiar names are missing, probably due to the holidays. If no one else has replied in several days, please bump this again, maybe on New Year's Day, when everyone starts trudging sadly back home.
In my case they only reported the high balance limit. I disputed this and the result of that was that it was correct. Called BA, was informed that the balance reflected on my credit report should be my actual credit limit on the card which is $10,000, not the high balance of $7400.