There are some people who are hyper-suspicious, and see
fakes where there are none. If you're not sure, don't buy it without independent authentication, in hand, from someone with the right qualifications. It's not worth taking the slightest risk with the sort of
money you'd expect to pay for an
aureus. but that being said, I can't see anything wrong. The only thing is, I wonder why you're considering blowing that much
money without, as far as I can see, learning very much about the coins first!