If the money was not banked you still have the invoices / receipts associated with the payments.
You will not be able to reconcile those but you will be able to allocate the invoice amounts as expenses, etc. for which you have receipts and where there are more invoices than unallocated expenses then if he is self employed puyt to takings and if a limited company put to directors loan account.
The other alternative is that you now bank all of the money taken and restart properly.
Either method will yield the same results.
There you go, not so catasptrophic as it first looked.... I hope. The key here is having invoices or other evidence of income in the absence of a bank record of the payments receieved.
kind regards,
Shaun.
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Shaun
Responses are not meant as a substitute for professional advice. Answers are intended as outline only the advice of a qualified professional with access to all relevant information should be sought before acting on any response given.