Declaration of Diligence / Rtn of Service of Summons & Compl ?

It means that the plaintiff attempted to personally serve a defense but was unsuccessful. The declaration of diligence sets forth the various efforts to effectuate personal service. That declaration can be used to support substituted service, which is apparently what plaintiff is contending here. The date of 6/27/12 is just the date that these documents were filed with the court. The date does not indicate when the process server or plaintiff turned in the proof of service, nor the date of the service.