There are still no definite leads on the identity of the so-called "Piano Man" despite more than 500 calls from the public, his care workers have said.
The mystery patient is described as tall and thin
The mystery man, who has been unable to communicate with police or carers, was found wandering the streets in Sheerness, Kent, in a soaking wet suit.
He stunned carers by drawing detailed pictures of a grand piano and giving a virtuoso classical piano performance.
But he has not said a word since police picked him up on 7 April.
His social worker Michael Camp said: "A lot of the calls are people suggesting what they think might be happening to him which is not really what we're looking for.
"We haven't got any definite leads... we need to sift through the information."
He said one lead that the man might be from Sussex had been investigated and discounted.
"I have followed that up and it is a definite no no.
"The person, at the time they phoned in, only had a verbal description from the radio. Once they saw a photo, that wasn't the person," he said.
Mr Camp said the man, in his 20s or 30s, is usually very anxious but "comes alive" at the piano.
West Kent NHS and Social Care Trust said it welcomed the overwhelming public response.
"Mr X continues to be cared for by the trust and there has been no change in his condition," a spokesman said on Tuesday.
Mr Camp had earlier said it was possible the man's identity may never be known.
"If nobody can name this guy then I don't see how we can possibly find out.
"The only other way is if we get expert people working with him who are able to use his music and get his identity."
Orchestras around Europe are being contacted to see if they know the man.
His talent came to light after staff at the Medway Maritime Hospital gave him a pen and paper in the hope he would write his name and instead he drew the piano.
The man shocked staff with a performance of classical music after Mr Camp showed him the piano in the hospital's chapel.
Mr Camp said: "When we took him to the chapel piano and it really was amazing."
The man has since written music, which has been verified as genuine.
Several lines of inquiry have been followed, and the hospital brought in interpreters to see if the mystery patient was from Eastern Europe.
He is now being held in a secure mental health unit in north Kent while an assessment is carried out. Mr Camp said he was "extremely distressed" and may have suffered a trauma.
"We are aware that he is a very vulnerable man and we would be putting him in a dangerous situation if we let him go."
It was revealed that the labels had been removed from every item of clothing the man was wearing when he was found on The Broadway in Minster, Sheerness.
The case has drawn comparisons with the 1996 film Shine which depicts the story of acclaimed pianist David Helfgott who suffered a nervous breakdown.
Anyone who has information about The Piano Man is urged to call the National Missing Persons Helpline on 0500 700700.