Under the new ebay rules, I don't think you will get a defect.

Keep your communication open - you may need copies of your emails to the buyer - if a dispute has been opened, follow the prompts to either offer a refund or substitute - (I'm a bit hazy on this - probably someone with more experience on disputes will help here)

Starting 20 February 2016, the following no longer impact your defect rate:

• Buyer Feedback
• Detailed seller ratings (DSRs)
• Returns requests that are successfully resolved with your buyer
• Items not received requests that are successfully resolved with your buyer