My boyfriend is being charged with PC AT459-1 F PC 496(A F VC 2800.2(A F what does it all mean? How much time is it?

PC459-1 typically means first degree (or residential) burglary. This is punishable by up to 6 years in prison. I'm not sure what the "AT" stands for. It could mean "attemped" which would reduce the maximum on this charge to 3 years. PC496 is possession of stolen property. Most of the time it is related to the same facts as the burglary so it would not add extra time. The VC2800.2 is evading while driving recklessly. This can add another 8 months. The actual sentence can be higher depending on his record or lower depending on many factors. Leaving California does not help as the prosecution will argue it was a sign of his consciousness of guilt. It will have to be explained away.