Now that you point it out, it certainly is a strange transition between the knife and the suitcase. It also seems strang to say red knife with ornament or red knife with broken ornament in a description rather than 'red knife with name on it in gold lettering' or something.

I doubt a knife came from the suitcase, but the intruder may have had a great deal of time and inclination to rummage in things.

It also seems strange to say 'knife' instead of 'pocket knife'.