Authenticity ID help - Chinese dao

[KuKulzA28]

Last night a dao popped up on eBay and I worked out a deal with the seller to "buy it now". Unfortunately, as soon as he had changed it, someone had bought it before I could hit the button and buy it myself. I was of course angry because I had worked out a deal and was... usurped? ousted?

But I will take this as a learning experience. This sword has certain things I found suspicious and I wanted to see if I wasn't the only one who saw these attributes...

Since the auction is over I can post pictures...

I think the brightness of the blade is a bit concerning as is the upside-down end of the sheath.