Nick Nack was an all-round personal assistant to Francisco Scaramanga, acting as butler, housekeeper, and chef (trained at Le Cordon Bleu), as well as a henchman to Scaramanga's criminal activities.
Although Nick Nack was very loyal to Scaramanga, at times he would hire other assassins to kill him. Scaramanga tolerated it as a means to practice his skills, but Nick Nack was also the sole heir to Scaramanga's estate; if the assassin had succeeded, then Nick Nack would have inherited everything.
After Scaramanga's demise and the destruction of the estate (thanks to Goodnight knocking one of the henchmen Kra into a boiler), Nick Nack tries to kill Bond and Goodnight onboard the junk and after a brief fight, Bond stuffs him in a suitcase and locked him in a wooden cage hung from the yardarms of the ship. His current status is unknown.
I hope you have just as much finding them as I did hiding them. If you find any of the caches along the way in need of attention, please contact me via my GC.com profile.