I was wondering the same thing about the Google Nexus 10 with 32GB, as E-Bay is one of the few places where you can purchase that model of tablet. I read on another Message Board that "HAVXAR is manufactured for the UK and HAEXAR is manufactured for the USA. Answer came straight from Samsung 11/2/13 in addition you should buy the product that matches your location."
I don't know if there's any difference in the two models...except for the fact that the HAVXAR model has the 4.0 Jelly Bean Android OS, while the HAEXAR has the more advanced 4.2 Jelly Bean Android OS. The fact that you got a reply from the e-Bay seller confirming that his tablet was the HAEXAR makes me feel better, as I live in the U.S. and prefer to purchase a tablet made here (besides which, I don't want to have to worry about any possible compatibility issues with the tablet.)
Just wondered....did you purchase the tablet from the e-Bay seller after all? And was it really "NEW and NEVER OPENED" as claimed in the ad? Thanks!