A Fox News producer reportedly shipped those documents via overnight service — but the documents never arrived, instead someone within the shipping company allegedly opened the package and removed the contents.
Through all of this, Carlson chose not to name the shipping company in question.
On Thursday, Business Insider reported that UPS told the outlet that it was the company that had lost the documents and that it was running an internal investigation to figure out just what happened.
UPS Corporate Media Relations Director Glenn Zaccara told Business Insider that Carlson's "package was reported with missing contents as it moved within our network."
"UPS is conducting an urgent investigation into this matter and regrets that the package was damaged," Zaccara said, according to Business Insider. "The integrity of our network and the security of our customers' goods are of utmost importance. We will remain in frequent, direct contact with Fox News as we learn more through our investigation."
Carlson on Wednesday offered praise for the shipping company's efforts, saying, "They went far and beyond, but they found nothing."
He noted that UPS "went through the office in New York where our producer dropped that package off" and "combed the entire, cavernous sorting facility. They used pictures of what we had sent so that searchers would know what to look for."
The company also searched the vehicles and plane that carried the package, Business Insider said.
Carlson concluded that "the company has no idea — and no working theory, even — about what happened to this trove of materials, documents that are directly relevant to the presidential campaign."
Tucker: Hunter Biden documents suddenly vanishwww.youtube.com