Okay, I can tell you how IMM1017 comes into play here (been a while.......
). While you show up for your appointment at the DMP with Appendix C, it is in fact IMM1017 (they have copies of these at their disposal) that the DMP signs and gives to you so you can include as an original in your application.
The very last item on the document checklist for the outland family class application says, "Proof of medical examination of the sponsored person and each of his or her dependents (original copy 2 of form IMM1017 signed by the examining doctor." In addition, if you looked at the checklist that's in the Part 3: Country Specific Instructions form for the United States (the same form that contains Appendix C that you bring in to your doctor), it says, "Include for yourself and each of your family members Copy 2 of the Medical Report-Section A that the DMP will sign and give to you when you undergo the medical examination. See Appendix C for additional information." Well, "Medical Report-Section A" is basically IMM1017.
Regardless of whether the receipt has more information than the form that was given to you by the DMP or not, you cannot send proof that you underwent the IME by way of a receipt. You must send the IMM1017 (specifically, it's usually the IMM1017 EFC which they give out for people who are outland, excessive-demand exempt, and who present the Appendix C at their appointment). If they gave this to you, you need to make a copy of it for your records and send the original to Buffalo as I cannot imagine they will disregard the fact that you lack a major required document. If they did not give you copy 2 (and I can't believe they didn't since they apparently sent the form to Ottawa), then I really have no idea what to tell you.
The IMM1017 form that you were talking about being for inlanders.....that's the IMM1017 SLC, which is for sponsored applicants processed inside Canada and also excessive demand exempt. That is but one of the 1017 forms they deal with.