The proprietor may move tax paid or tax determined spirits or wines across bonded premises. However, tax paid or tax determined spirits or wines may not be stored or allowed to remain on the bonded premises. The proprietor must keep tax paid or tax determined spirits or wines separate from spirits or wines on which tax has not been paid or determined. Spirits returned to bonded premises under the provisions of 26 U.S.C. 5215 may remain on bonded premises.