If, as Kirby's tweet impies, they have the information they were looking for, then they don't need the routers, either.

The requests for passwords and routers are for the sake of optics. They want the public to know the Board of Supervisors was given an opportunity to come clean. (Notice that the requests and replies are immediately made public.)

Continued attempts by the Board of Supervisors to hide election data, the media's attempts to discredit the audit, and the DOJ's threat to interfere in the audit all point to the Senate being in control of the process.

Judging by the tone and content of messaging by the Senate leadership, it seems they already have enough information to know the likely outcome of the audit.