This is a bit of an interesting and somewhat unusual situation. In most cases, your finance team (internally) will be the one to pick up on the fact that stuff

This is a bit of an interesting and somewhat unusual situation. In most cases, your finance team (internally) will be the one to pick up on the fact that stuff doesn't make sense. They won't be able to tie the invoices to subsequent payment to get an accounts receivable schedule to show who still owes what. They won't be able to get the stripe reports / merchant clearing disbursement reports to agree to the GL clearing accounts. It's also rare for the CEO to have the only access to bank statements. Fraud risks are often higher in finance team, as they are the ones who catch problems elsewhere, but can be hard to catch problems with them. This make me wonder how experienced the startups accounting team was.