Thank you for responding!Hi! There's no authenticator for Miu Miu here, unfortunately. Your best bet would be to use a private service. I heard good things about Authenticate4U, but I don't know if they do this brand.
From what I personally can see, it could be ok. But please note that this opinion is based on me owning two bags and perusing the Authenticate this Miu Miu threads, that's all.