No- The autopsy is supposed to get as close to the time of death as possible. They found him dead right? I scanned the report looking for a "Postmortem Interval". I did not see it. Did I miss it? This could affect drug testing results and much more. If there were other shooters and he was a patsy he could have been shot hours earlier. We need to find the cause behind this error. Call it up for review.
"The determination of time of death is of crucial importance for forensic investigators, especially when they are gathering evidence that can support or deny the stated actions of suspects in a crime.
The time elapsed from the moment of death until a corpse is discovered is also known as the postmortem interval, or PMI.
Both the time of death and the postmortem interval cannot be determined with 100% accuracy, particularly when a body is found in advanced state of decomposition or is recovered from fire, water, or ice. Therefore, time of death and PMI are given as estimates, and can vary from hours to days, or from months to years, depending on each particular case."
http://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/time-death
Since he wasn't out in a field getting eaten by bugs and rained on, it ought to be relatively easy to get a more accurate time of death.
I'm guessing if they received the body days afterward that meant he was probably stuck in a freezer for a while which might explain the inaccurate time of death.
Your guess is as good as any. They need to call it up for review.