Whenever any eggs subject to the Act are found by any authorized representative of the Secretary upon any premises, and there is reason to believe that they are or have been processed, bought, sold, possessed, used, transported, or offered or received for sale or transportation in violation of the Act or the regulations in this part, or that they are in any other way in violation of the Act, or whenever any restricted eggs capable of use as human food are found by such a representative in the possession of any person not authorized to acquire such eggs under the regulations in this part, such articles may be detained by such representative for a period not to exceed 20 days, as more fully provided in section 19 of the Act. A detention tag or other similar device shall be used to identify detained product, and the custodian or owner shall be given a written notice of such detention. Only authorized representatives of the Secretary shall affix or remove detention identification. The provisions of this section shall in no way derogate from authority for condemnation or seizure conferred by other provisions of the Act, the regulations in this part, or other laws.