greater weight as they age until at ten months when there is little chance of undetected fraud yet being detected they reach their maximum weight purchase requests from public and semi public telephone numbers such as numbers originating from motels and pay telephones are given an origin history factor of 0 2 because no meaningful history can be compiled equation 2 also a person wishing to commit remote purchase fraud is likely to use a telephone which cannot be traced to his or her home address where he or she is more likely to be identified therefore telephone calls originating from public or semi public telephones are more likely to originate fraudulent calls next an inquiry is made into whether or not an item in the same merchant defined merchandise category has been purchased within the previous merchant set time period divided by the purchase request history factor decision box 118 sophisticated remote purchase thieves may try to steal a sizable quantity of particular product because it is easier to illicitly reintroduce a set of uniform items back into the stream of commerce than to do the same for an eclectic mix for example a ring of thieves may attempt to.