OP, may I advise you against drinking any homemade liquor a stranger sends you through the mail? There are shitheads from across the globe here, and you're just asking for trouble if you do that.
Always be able to verify manufacturers and that the bottle is properly sealed! No need for anymore negative bitcoin publicity because you were too negligent to check the product
But if they are a "bad guy" it is not going to be horribly hard for them to reseal it. I would imagine in a lot of bottles they could put on a new cap. So there is some danger.
Just like you should never leave your drink alone at a bar.... dont trust others with what's in your drink.