At the top, it bore the printed stamp of Messrs. 
( ( At ( the top ) ) ( , ( it ( bore ( ( the ( printed stamp ) ) ( of Messrs. ) ) ) ) ) )
(ROOT (S (PP (IN At) (NP (DT the) (NN top))) (, ,) (NP (PRP it)) (VP (VBD bore) (NP (NP (DT the) (VBN printed) (NN stamp)) (PP (IN of) (NP (NNP Messrs.)))))))
They had no idea where the package had came from as it did not have a stamp.
( They ( ( had ( ( no idea ) ( where ( ( the package ) ( had ( came ( from ( as ( it ( ( did not ) ( have ( a stamp ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD had) (NP (NP (DT no) (NN idea)) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN package)) (VP (VBD had) (VP (VBD came) (PP (IN from) (SBAR (IN as) (S (NP (PRP it)) (VP (VBD did) (RB not) (VP (VB have) (NP (DT a) (NN stamp))))))))))))) (. .)))