"It seems UPS delivered one of the eight boxes to the wrong address," Miller said.
Rosenberg said UPS is still looking into what, exactly, went wrong. "We deliver nearly 17 million packages every day, and sometimes a mistake can be made," she said.
Seventy_Seven said in his Reddit post that he contacted UPS, but a representative insisted the box belonged to him.
After Seventy_Seven's post went viral, he wrote about his increasing concern as fellow Reddit users wondered aloud about whether he could land in trouble. Finally, he said, he heard from higher-ups at both UPS and NOAA.
Watch: Is the shipping industry out of the woods?
Seventy_Seven didn't reply to a request for comment, but he seems relieved to be getting rid of his ill-gotten drone after enduring a day of ribbing from Redditors joking that he'd wind up dead.
He replied: "All of this info is making it really tempting to keep it."
—By NBC News' Julianne Pepitone