While it’s understandable, even expected of global shipping companies like FedEx to mix up a couple of the millions of packages it ships out on a daily basis, we could never have imagined the kind of mix up James Potten of Bristol, England, had recently. Inside of the box he thought contained a brand-new Kindle, Potten unboxed a "tumor specimen return kit."

"My name was on the outside, but the contents weren't what I expected," he told BBC. "I haven't opened the sealed box, which says exempt patient tissue, as it doesn't belong to me. The tracking code on the item had the same first five and last three numbers as my order but it wasn't my Kindle."

The package delivered to Potten's door was supposed to be deposited at the Royal Free Hospital, which BBC said had been made aware of the mistake. In a statement, RFH said, "If [we were] the intended recipient...we will await answers from the delivery company as to how this mistake was made."

After receiving the package, Potten, an environmental consultant, requested someone from FedEx come back to retrieve it.

"I've been trying to get FedEx to collect it as it is potentially a sample that needs to be tested and sent back with some urgency," he told the BBC.

FedEx issued an apology for the "courier mix-up," and said it would consider changing their processes in the future so something like this wouldn’t happen again.

Potten did eventually receive his Kindle.