Where is the HMNZS Royalist Bell?

The following has been received from Graham Cadwallader (Caddy)
I’ve contacted the Naval Museum on this subject and just received a negative reply.    Around 1962 my Bev presented me with a set of twin girls.   Later that year they were christened on Royalist and their names (supposedly) engraved on the bell.
The twins have pestered me regularly over the years about their “names on the bell”!   Their 50th birthday is on the 7th of May and I have received another request for “their” bell!
The Naval Museum says it’s not in their collection and suggests that it may have been taken – relocated – presented – or be in someones private collection.
If the bell is able to be located,  I would appreciate a photograph of the names or permission to photograph the names.
Their names:    Lynda and Pamela Cadwallader
If you know the whereabouts of the Royalist Bell – please advise me in order that we can fill Caddy’s request and get the twins off his back… (only joking)