When Mark Arabia, owner of the Pets Plus store, went out to the delivery man's vehicle to collect the $1,000 fish supply he discovered a coffin.
"At first when I looked at it, I said, 'Fish never come this way'," he said.
He said he eventually learned that the body inside was that of a 65-year-old man from San Diego, California, who died of early onset Alzheimer's Disease.
The body was supposed to go to a laboratory in Allentown, Pennsylvania, but there was an "unfortunate mix-up" at Philadelphia airport, said US Airways.
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