I've only ever been asked for supplier invoices once in the last 10 years.
Never been asked for on a recent account (last couple of years)
Imo if your 'business growth' shows a steady rise over a reasonable period of time then it is unlikely to p/p's attention and result in a request for further info.
What may cause a request could be buyer complaints regarding authenticity or quality.
Spreading sales over multiple accounts is a sure way of reducing the risk.
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