Section 468 IPC is forgery for the purpose of cheating. If sale agreement and/or money receipt have fake signatures, then it is forgery. If this forgery was for the purpose of cheating (as you have said), then Section 468 IPC may be applicable.
Section 471 IPC may also be applicable if such forged document has been used as a genuine document, as you have stated.
Section 409 IPC is criminal breach of trust by banker, public servant, agent, broker, etc. Usually, Section 420 IPC and Section 409 IPC are not applicable together. In the facts mentioned by you, Section 409 IPC may not be applicable but Section 420 IPC may be applicable.
This is just a tentative reply on the basis of brief summary of facts mentioned by you. For more accurate opinion, you should consult some local lawyer by showing him relevant documents and sharing full detailed facts.
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