We've all heard about these on the Discussion Board and some of us have unfortunately experienced them too.
Read this thread for complete insight into how ebay expects sellers to respond to a Returns Case cited as Significantly Not As Described even when the buyer admits in Messages that it is not.
http://www.ecommercebytes.com/C/blog/blog.pl?/pl/2016/11/1479088848.html
Citing thread from our neighbours down south: http://community.ebay.com/t5/Shipping-Returns/Well-here-we-go-again-another-SNAD-claim-Is-there-no-e...