In case it helps, these are the additional protections for sellers currently being provided during covid-19:

https://sellercentre.ebay.com.au/news/covid-19-updates/faqs

It's worth bookmarking the page because they are not included in the standard policy pages, and it's difficult to find these through the help and announcement sections. 

If the buyer does open a case, hop onto chat as soon as you can, and confirm that the protections will apply, as even if you tick all the boxes to be eligible, eBay may not apply them automatically.