Some months after the Somerton Man's body was discovered a copy of the Rubaiyat was handed in to police by a local 'businessman'. The final words “Tamam Shud” had been removed. It was claimed that the book had been thrown into a car parked not far from the beach where the man's body had been found some months before, around the time of the Parafield air show. On the back of the book was the code and at least one telephone number. The phone number X3239 turned out to be that of a nurse called Jessica Ellen Thomson (née Harkness) [Jestyn], who was living at 90A Glenelg Street, not far from the beach where the man's body was found.

The telephone number however wasn't just used by 'Jestyn', it was also used by her "husband", Prosper McTaggart Thomson, for his business. The number has appeared in the local newspaper a number of times. It is therefore possible that the telephone number has nothing to do with Jestyn but was related to her husband's business. It is also possible that the Somerton Man was enquiring about an advert that had been placed in the Advertiser. He could have wanted to hired Prosper's car.

We do not actually know how many telephone numbers were on the back of the book. It is often stated that there was another number on the back of the book, for a local bank, but this is unconfirmed.