Welcome to the forum.
It is a crying shame that, when someone posts pictures of their new raw purchases, rather than congratulate them and brag on their coins, we have to be concerned about whether the coins are products of our "friends" across the Pacific. I am so frustrated with not only the counterfeiters and the complicit government that supports them, but places like Etsy, Mercari, and yes, Ebay, that allow garbage to be pushed on trusting buyers, and do little or nothing to stop it.
Sorry to rant on your post, but this is a sore spot. They look good, and I hope they are authentic, but this is definitely not my area of expertise.
I sincerely hope they are genuine.