First, I hope to God you are not paying for this time in the right seat of an airplane that requires only one pilot even with passengers on board.............unless insurance requires it. On the empty legs you SHOULD log it as PIC time if you have a commericial multi instrument rating but keep good records of this small sliver of time in your career. Hopefully you will upgrade to PIC and all of this time will blend in anyway and by the time you are on your second or third logbook........no one will notice or care. I keep hearing about what the airlines consider PIC time but who the hell wants to go to an airline nowadays and whos to say that is going to be your next step????? You may want to go to a corporate or freight department and all they care about is you telling them you have 500 pic multi to fill their insurance requirement so they can fill a seat. Bottom line............you can legally log it PIC if you are flying the 91 legs in a Cessna 402 assuming you have your commercial multi. Every place you will apply to will give you the heads up on what they consider PIC..........some will allow it and some wont. The airlines especially the commuters are the ones you will most likely have the most explaining to do.