mynetthebest, so if its possible maybe u can give some more info about that how to try that 5% chance, i have access to the same network which POS system is, POS model is iCT220, im new about POS systems, so i can give you more info if u can help.
you need to find out how the debit and/or credit terminal is hooked up to the machine.. RS232 "COM", ethernet or what not. Then get software that logs RS232
1-did you have ADMIN access or User acces to the server ?
2-OS on server ?
After u valid that , you must look if it possible to got the swipe of dumps ( coz u could have POS server but Creditcard transaction can run on other PC at POS .. etc....
PS: It not just Put software called "EasydumpsHack " and run it on SERVER for get DB's . It bunch of work , trust me .