NSFT said the man had been an inpatient at the Woodlands Unit, which is based on the site of Ipswich Hospital.
The full report has been sent to the independent investigators of the statutory Child Practice Review, which is being carried out by North Wales Safeguarding Board.Cyngor Gwynedd said it had received "legal advice from independent experts on the next steps".
It added: "As a responsible employer, Gwynedd Council has a responsibility to respect the confidentiality of staff. Because of this, we cannot share information relating to the employment of individuals."A request for comment has been passed on to the absent staff members through Cyngor Gwynedd.The body of a "vulnerable" 16-year-old boy who went missing at the weekend has been identified.
Athrun, who was autistic, and believed to be wearing only blue and white patterned swim shorts and no footwear, was, North Wales Police recovered a body and it was identified as Athrun, from South Gloucestershire on Thursday.
Ch Insp Trystan Bevan said: "Our thoughts are very much with Athrun's family, who wish to thank all agencies and members of the public for their overwhelming support with the search, and for not giving up on his recovery."
He added: "This is not the outcome anyone hoped for, but we hope it can now provide some answers for Athrun's family."Rhodsac Community Living Ltd, which runs the home, was approached for comment.
The CQC inspected the five-bedroom property in November and December.It said the home breached three legal regulations in regards to safe care and treatment.
Many of the concerns were raised by the families of residents."Their concerns included the delays in appropriate action in response to a broken side gate, rubbish outside the front of the home, smoke alarms seen open with no batteries in place, light switches hanging off the wall and loose stair carpet," the report said.