Savings Bonds Where To Cash

Question: Info of Savings Bonds?
My mom recently passed away. We found a list of Savings Bonds she had left in a folder “Things my family should know.” She also listed the series number of each bond. We haven’t located any bonds. Does anyone know if there is a site where you can see if a savings bond has been cashed in? They were purchased many years ago. Trying to settle her estate has been a nightmare and any info would be greatly appreciated. Thanks
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835 Cash in club. Cash machine. Part 1