Order processing fraud is not returns fraud
Order-stage risk scoring happens before fulfillment: is this order likely to be fraudulent, will the card get disputed, does the shipping and billing mismatch suggest account takeover. Returns fraud is a separate problem that happens after a legitimate purchase, when a pattern of returns suggests wardrobing or abuse. The two need different signals and different rules, even though they both get lumped under fraud.
This page covers the pre-fulfillment side. The returns-specific fraud and abuse detection, including serial-returner patterns, is covered on the AI returns automation page.