Question

The invisible man very angry when he found the two investigator examine his belongings elaborate

Answer 1

i suppose this is a scene of a murder's investigation, where the invisible man refers to the dead man who is watching the investigation of his own place. there are 2 investigators who are examining the dead man's (invisible man's) belongings, in order to search for proofs. the dead man is a bit possessive towards his belongings and does not like these strangers(investigators) touching them and so is very angry.