Amend Form 5500 for Retroactive Fidelity Bond?

A client established a 401(k) plan as of January 1, 2020, for which it never obtained a fidelity bond. The plan administrator filed Forms 5500-SF 2020-2022 and 5500s for 2023 and 2024, and correctly check the "No" box for the question of whether during the plan year the plan was covered by a fidelity bond.  The client recently obtained current and retroactive fidelity bonds for all years going back to 2020, and the question is, can, or should, the plan administrator file amended 5500s for plan years 2020-2024 to show that the plan was covered by a fidelity bond?

Thanks for your time!

I would tend to say that's not necessary.  I've had IRS audits for clients where they checked the 'No' box and never got a bond, where the auditor simply says "...and tell them to get a bond".  Your situation is even better because you can tell the agent that a bond was obtained and the year in question is retroactively covered.  We can usually get the agent to tell us why a certain plan was selected for audit and my experience has been that it was never because of a lack of a bond.

I agree. We've also had DOL audits (excuse me, "investigations" - we had a DOL "auditor" get snippy when we referred to her as an "auditor" rather than an "investigator") where the response was identical - "get a bond" - and no penalty was imposed.

@Connor and @Belgarath, thank you both!