Translate the following sentence into Turkish.
"As to his place of origin and the source of his first capital... "the most painstaking investigation has shown... that these are quite impossible to trace."
"Memleketine ve ilk sermayesine gelirsek,... en itinalı araştırmalar bile göstermiştir ki... bunlar neredeyse ulaşılması imkansız bilgilerdir."