You're partly right. People from both sides have publicly alleged claims of fraud without presenting any concrete evidence.
But what do you mean he's looked for evidence? I'm not aware of him launching any audits. How could he? That's the rub. The gatekeepers with the authority to investigate refuse to do so without being forced and even then they obstruct along the way.
Remember Brad Raffensperger originally saying nothing was wrong with GA elections then acknowledging problems in Fulton County and promising to get to the bottom of it? Whatever happened with that? All he did is throw Rob Pitts under the bus then let the story cycle out of the media spotlight.
Doesn't matter the party, no one close to elections wants to crack open that package. Why?