If LE had them IMO they would have been released a long time ago, and also would have been mentioned in the cell phone reports. It is my understanding that text messages cannot be retrieved once they are deleted by both parties. We are lucky to have as many text messages as we do, because Amy's phone happened to be able to save large numbers of messages.
There is absolutely no chance of George being Caylee's father. The FBI didn't produce a report specifying that conclusion, because LE only asked them for a report about Lee. However, the FBI had George's DNA for other reasons (checking against DNA found on physical evidence) and did produce his DNA chart, as well as Caylee's and Casey's. If you know about DNA, you can read the charts and see that there is no way George could be Caylee's father.