Just received a response from them.
Hello,
We have set aside items from the inventory you have sent to our fulfillment centers because there’s a concern about the authenticity of the items listed below. We would like to work with you to resolve the concern and complete our review.
ASIN: B0097CZJEO - Apple iPhone 5 Unlocked Cellphone, 16GB, White
What you can do
Email
seller-fba-inventory@amazon.com within 30 days and include the following:
1. Copies of invoices or receipts from your supplier issued in the last 180 days. These should reflect your sales volume during that time.
2. Your supplier’s contact information including name, phone number, address, and website.
3. Any additional details you would like us to know.
You can remove pricing information, but make sure the rest of the document is visible. You can send us a pdf, jpg, png, or gif file.
What happens next
We’ll review the information you send and get back to you with an answer within 1 business day. We may provide these items, any evidence that you provide to us in your appeal, and any other relevant information to rights holders or other third parties. Once we confirm the information you provide, the review of your selling account will be complete.
If we are unable to confirm the information you provide or determine that the items are authentic, you will be responsible for all costs related to the appeal process.
If we do not hear from you within 30 days these items may be destroyed at your expense.
Do I have to send the invoices? I just want the product back. Will they be giving it back to me?
