Unless you are a regulated person, you cannot request physical delivery of U3O8.

Uranium mining, processing, transport, and storage operates under stringent regulations. As a result, physical delivery to any person is not feasible, unless that person is regulated by a competent national nuclear regulator. If, however, an investor opens an account at a regulated warehousing and conversion facility, a book-entry based credit transfer of U3O8 to that account is possible.