I totally agree with you about checking the legality of it all and many other issues first. Which is why I am also writing in this Forum, in the event I can locate anyone who has actually gone through and bought in this manner. Or who knows anything more about this method of buying than what the 2 websites I have given tell us.
Not seeing inside is a problem and have yet to decide if I am prepared to take this risk.
I am not sure if Mark Stucklin will advise or not or is this Forum just for us website users.