Having no 5498 and no way to retrieve it

I have been retiring and the last time I made a contribution to non deductible traditional IRA was in 2018. A tax preparer advised me to put in the form of bank CDs while I was working and the funds were consolidated and moved around. I moved and shredded most of my form 5498. The original local banks are no longer in business. I keep form 1040s and form 8606s. Would that be good enough to show IRS if I plan to convert or withdraw later. Please advise