There’s 2 options here I would suggest:
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Reconcile your records
If you have a record of your petty cash elsewhere (e.g. you know what you’ve taken daily from till readouts, and you know your deposits from the bank statements), then reconciling your records could be useful - it depends on how many transactions you have. Take a look here for more info -
Back Ups
Similar to the reconciling option, if you have monthly/weekly back ups enabled, you would have a record of the petty cash account in there, which you could use to match up missing entries etc.
I hope that helps