This is a different issue, from quite awhile back, where some think the FBI were hiding evidence of corruption related to the DNC. Some suspect Seth Rich was murdered to prevent him from leaking some sort of information to the public.

Recently, the FBI whistleblowers have exposed that the FBI was under order to ignore some aspects of corruption surrounding the Hillary Clinton campaign.

Another bit of evidence suspected to hold evidence of corruption or worse, related to the DNC or specific Democrats, was the one that belonged to Anthony Wiener, which he referred to as 'insurance files,' reportedly it made seasoned FBI investigators literally sick. Yet, Wiener was convicted and went to jail, but we've never heard of his laptop or insurance files again.

So, you can see how this is very similar to the Biden laptop.