(S (S (BASENP (PRP He)) (VP (VP (ADVP (RB then)) (VP (VP (VBD opened) (BASENP (DT the) (NN box))) (CC and) (VP (VP (VBD examined) (BASENP (JJ several) (NNS packages))) (PP (IN with) (BASENP (DT an) (NN X-ray) (NN machine)))))) (CONJP (COMMA ,) (CC but)) (VP (VBD found) (NP (BASENP (NN nothing)) (SBAR (S (VP (TO to) (VP (VB indicate) (SBAR (S (BASENP (DT an) (JJ explosive) (NN device)) (VP (VBD was) (ADJP (JJ present))))))))))))) (PERIOD .))