Well, I can tell you what management will say at some time in the future, "It was the carrier's fault, he was wearing improper foot wear. His manager was frantically looking for him on every shopping website, and couldn't find him. He sent out a sub to find him, because it was hot outside and management couldn't be expected to go out there. The sub wasn't a good "looker", because his shoes were also worn out too far. Management regrets that their workers are so awful about following safety rules".
Then the office will have a 1/2 hour per week safety video to watch until They are deemed safe again.
16 miles of walking per day is pretty long/hard in 95 degrees, they should have been calling any carrier that is stationary for more than 15 minutes.
Remember carriers, if you feel sick on the route, ask a customer for help, they'll listen.
After they call 911 for you enter "carrier reach, and unscanned parcels" over and over until the district bean counter calls you pm and wakes him up, so he'll come out and check on you.