Receipt issued and cancelled after that, but photocopied

dear querist,

its a question of fact and understanding in business matters and account deals whenever we issue any receipt there are two copies of that receipt first one is original one and second one is carbon copy,if we believe in your story then when your client comes abck to you for the cancellation of that receipt,accouint rules says that you will keep both the original copy and carbon copy attached again with each other and mark them cancelled the way you issued it and after this if your client is showing that xerox copy of original receipt which is cancelled ,stand no where and you can also lodge case of 420 ipc against him alongwith 138 nia act ,feel free to call if you had left any query.

sir, i have both copies original as well as carbon, but accused had photocopy as he had taken it for 10 minutes outside the premises, and now he is talking of it.

what are the harms he can do by that photocopy.