These days you can't stop zero feedbackers from buying, but what did they buy?

Was it a big thing or just a small to medium purchase?

If the latter and they paid, then give them the benefit of the doubt and post it off, but with tracking.

Yes, I'd be a bit unsettled to see the account was 4 years old but with zero feedback. Of course there can be reasons but all the same , it leans toward the more unusual side.

If I were selling these days and had a zero feedback account listed as overseas go and buy an expensive item from me, that is whan I'd be more inclined to make a cancellation, but then again, I am not much of a risk taker.