Final answer:
All the examples provided, including check forgery, false invoices, stock theft, and credit card fraud, are considered external fraud under the KPMG categories of fraud, as they are all perpetrated by individuals outside of an organization.
Step-by-step explanation:
When examining the KPMG categories of fraud, all the examples you've listed are considered external fraud. External fraud is perpetrated by individuals outside of an organization, typically against that organization. Check forgery involves falsifying a bank check, false invoices can be submitted by an outside vendor to receive unearned payments, stock theft may involve outsiders stealing physical inventory, and credit card fraud generally involves an unauthorized individual using another person's credit card information for financial gain. In contrast, internal fraud is committed by someone inside the organization, such as an employee or manager.