This isn't the first time the FBI colluded with CBS against one of its journalists

Are CBS and the FBI Colluding to Burn a Reporter’s Confidential Source?

'It is odd or unusual that a forensic consultant retained by CBS would hand-deliver evidence to a third-party and there be no record of what evidence was removed, copied, or provided...'

Was CBS’s seizure of Herridge’s files related to the hunt for the source that leaked her FBI records?
It’s certainly plausible, as CBS has likely been infiltrated by the FBI.

In 2011 an FBI memo surfaced, revealing that an ABC News journalist had been doubling as an FBI informant in the mid-90s. That journalist/informant, Christopher Isham, had moved on to serve as the vice president and Washington bureau chief for CBS by the time the FBI memo was made public in 2011.
Former CBS journalist Sharyl Attkisson, her former employer still has data from a computer she used when she was investigating the Obama-era Operation Fast and Furious scandal.

THE ANSWER: YES!!!!!!

"CBS apparently seized computers, records and files of the now-former investigative reporter Catherine Herridge, who has recently been fired from the network, according to Jonathan Turley.

Turley, a professor at George Washington Law School, said he talked with people presently and formerly employed by CBS who confidentially told him they do not recall senior staff ever taking such a step before. At the time of her departure, Herridge was investigating special counsel Robert Hur’s report on President Joe Biden, allegations of corruption against the president and Hunter Biden’s laptop, Turley noted.

One former CBS journalist reportedly said staffers have never seen the apparent seizure of records and files from departing staffers."