It might be difficult to validate your goods if you lack an invoice from the manufacturer or brand owner. Your account might get suspended for a minor customer complaint, and then you would need to resubmit the supporting documentation. Amazon must verify that the goods you sell are authentic.
Keeping all the documents in good condition and working with trustworthy suppliers will be more beneficial for you in future. Also, you can request for authority letter to resell their goods. Be always careful in business and you will be on the safer side.
It is useful to have approved invoices that accurately describe the product’s name, amount, description, and sales of the previous 365 days of sales. You should be acquainted with the supplier’s website, phone number, and e-mail address. Without this information, your appeal may be dismissed or refused.
Also, do not make any changes to the invoices. It is better to have no invoice than to be caught by manipulated ones.