The likelihood that it was mailed to Tucker directly and not a staffer would be weird. Someone has to pick it up and it wouldn't get the host. How would they know what was in the package. It would almost had to be someone in the receiving office. If they did fill out the paperwork to send it to Tucker Carlson maybe someone down the line could figure it out. This was before the story. Was it reported he was in California to do the interview?
Also wouldn't the company call the police in to do all of those interviews? It's a federal crime to tamper with the mail. Could be random theft. I doubt the fbi would do it, but I doubt they could get a court order to seize mail from a journalist. It could be a random Biden fan. Sees it labeled to Carlson and steals it.