Procedures governing seizures and detentions are described in 19 C.F.R. §§ 133.21 through 133.24 for trademarks and 19 C.F.R. §§ 133.42 through 133.47 for copyrights. The final provisions regarding forfeiture and assessment of liquidated damages in connection with both trademarks and copyrights are contained in 19 C.F.R. §§ 133.51 through 133.53.