For the sake of other people who may be going through the same inconvenience with Coinbase's terrible customer support, did you do anything specific, make any specific statements (i.e. mention court orders or other legal processes), or contact them in any specific way that seemed to cause them to actually do their job, or was it just a case of constantly badgering them on a daily basis?

Pleased you are getting your bitcoin back, and hopefully you'll take all the advice on this thread to heart and not trust Coinbase (or any other third party) to hold your coins for you in the future.