How did you know that these chips do not come with this OSCAL value?
Read the datasheet - it's all there (no OSCCAL reg, but OSCTUNE reg).

Adding to rmteo's comments; none of the new chips (except the 10Fs) have OSCCAL. Reason is quite simple, they come trimmed from the factory; which makes their specs more tight than the ones with an OSCCAL reg. You can "tune" them if needed, but no real need to calibrate. If you place any of the newer chips on a frequency meter (one with a good reference); you'll notice they track pretty good. You only need to "tune" them if you need to track another free-running oscillator (read as if in RS232 clock/baud generator, etc), or want much better performance over temperature. The older chips with OSCCAL register were calibrated from the factory but their specs were looser and they could easily be erased (this was a big source of complaints).

At what level DO the chips come with this calibration value?
Older chips or lower end chips (10Fs) have the OSCCAL reg. You would much prefer the OSCTUNE register to the OSCCAL one (if given the choice).