You need to find the source as to how you purchased or retained these items and remit them to eBay as they requested. If you don't have them, my guess is your selling days on eBay are done.
It's a product with known counterfeiting issues. Sold out of some sort of overstock warehouse is not respectable provenance for anything as important as food going into young children with health issues.
It was a DME that had shut down, and they had a warehouse sale, not an abandoned warehouse that I drove by. He did drink it, and had no issues. I understand your concern though.
I'm guessing it was the 5 transactions for pediasure that sent up a red flag. As toysaver states, it's not a good look. They may come at you with the dreaded phrase "your selling habits are putting the ebay community at risk".
