Returning new, damaged parts

Greetings...50 years in the automobile trades, 6 months in GM parts. Thrown in the deep end of the pool and have been teaching myself as I go. Doing okay so far.
Two headlamps NIB with ears broken off. I did the "Submit Cust Exception" on PW+. Printed PC302s and labels, and sent them off. Looks like one was excepted, the other got me a Material Returns Notification declining the claim for lack of information.
Now the parts are at the PDC and I'm trying to get the documents corrected so I can get reimbursed.
Would like the cliff notes and or details for returning new, damaged parts. I look at different places, talk to different people, and get different - or maybe incomplete - details. Mailing documents, submitting documents, PC659...
Thanks
Two headlamps NIB with ears broken off. I did the "Submit Cust Exception" on PW+. Printed PC302s and labels, and sent them off. Looks like one was excepted, the other got me a Material Returns Notification declining the claim for lack of information.
Now the parts are at the PDC and I'm trying to get the documents corrected so I can get reimbursed.
Would like the cliff notes and or details for returning new, damaged parts. I look at different places, talk to different people, and get different - or maybe incomplete - details. Mailing documents, submitting documents, PC659...
Thanks