The site in question is not only well known on AAS forums, but also supplies materials used primarily by AAS users/UGL manufacturers, and for few other reasons.
They should, however, assume you are using such supplies for their intended medical purposes. Any deviation from this puts the company in question for consumers, as well as in jeopardy under the law.
Being paranoid might be fun, but it isn't needed here. Just do not order from them again.
Oh, and others very well might point this out, but including the company's name is generally discouraged. Having your question answered to hopefully some extent, you may want to edit this out of your post.