I think the mass media will just try to ignore it.
If that does not work they will claim “Russia, Russia, Russia” and claim it is fake.
If that does not work they will attack the sources by any means necessary (doxing squared).
After that _anything_ is possible, _anything_.
These folks are most dangerous when they are cornered.
They can claim Russia, Russia, Russia all they want. They will have to explain why Hunter Biden's lawyer emailed, and called the store to get the computers back.