"We don't know what the right story is about him. It's not normal. We were astonished that he was well and with a good constitution after living in the forest for five years."
Police have not ruled out that the boy might be suffering from some sort of mental trauma.
Mr Otter added: "We don't know if he speaks in an English accent. He is not a native speaker, but perhaps he learnt English from his father. It's not clear."
The Foreign Office was only made aware of the situation on Friday and officials have not yet established whether he is British.
"We are aware of the reports and we are looking into it," said a Foreign Office spokesman.
Adding to the problems of the German police is the distance Ray may have walked in two weeks. This would put him within range of the forests of Nationalpark Bayerischer, south of Berlin, parts of which extend into the Czech Republic. Alternatively, he could be referring to the Naturpark Erzgebirge, which is also south of Berlin.