The free tool you listed to clean up listing of active content has little to do with the auctiva hosted photos which begin http. Will it change them to https?
I put in the the listing number and it said no active content found. You see, eBay told me that if I didn't remove http content that Chrome users would be warned my site is insecure, meaning I will lose customers who use Chrome if they pay attention to warnings of in secure sites. What will you do about that? I am not the only one with this issue. It began Oct 17th.