Thanks all for the feedback on this - it's good to hear everyone's stories and experiences. I'll report back with what I discover. I don't have another box on hand to compare it to but I do have an old T8 I can use for a close comparison. Wouldn't be the end of the world if they turn out not to be authentic - I'm an avid eBayer and they always side with the buyer when an issue is reported.
Exactly. And those sellers don’t last long.