Dear Sabah, 

there are studies about genuine and simulated suicide notes. Maybe it's what you are looking for.

For example: 

Shneidman, E. S., & Farberow, N. L. (1957). Some comparisons between genuine and simulated suicide notes in terms of Mowrer's concepts of discomfort and relief. The Journal of general psychology, 56(2), 251-256.

Edelman, A. M., & Renshaw, S. L. (1982). Genuine versus simulated suicide notes: an issue revisited through discourse analysis. Suicide and life-threatening behavior, 12(2), 103-113.

Black, S. T. (1993). Comparing genuine and simulated suicide notes: A new perspective. Journal of consulting and clinical psychology, 61(4), 699.

Jones, N. J., & Bennell, C. (2007). The development and validation of statistical prediction rules for discriminating between genuine and simulated suicide notes. Archives of Suicide Research, 11(2), 219-233.

cheers, Justyna

http://www.tandfonline.com/doi/abs/10.1080/13811110701250176#.VsZIlMfLI64

http://psycnet.apa.org/journals/ccp/61/4/699/

http://onlinelibrary.wiley.com/doi/10.1111/j.1943-278X.1982.tb00917.x/abstract

http://www.tandfonline.com/doi/abs/10.1080/00221309.1957.9920335?journalCode=vgen20

Dear Justyna,

Though these studies are not exactly related to my study yet some hope is there...a silver light.... Thanks for your kind reply.

Regards.

Dear sir Ivo,

Thanks for such an excellent answer and for sharing with me the most useful and interesting books.

Regards. 

In ethnographic research it is not uncommon to have to disguise or alter details of case studies to protect the parties involved while trying to preserve the essential properties of the case. One very well known case from the Britain was Richard Hoggart's book 'The Uses of Literacy' in which many examples of popular writing were actually invented by Richard Hoggart at the request of his publisher who feared that real quotation might lead to legal action.