buffalo-toronto,
You put the sponsor's name and client ID on the RPRF receipt. But I also put my name (applicant) written in the margin and put one of the buffalo stickers on there too, indicating that it was the buffalo file #. I don't think I had to do that (add my name and buffalo file #), but I wanted to make sure it was matched up with my Buffalo file, so I figured it didn't hurt. But in the spaces you fill in on the form should show the sponsor's information and contact. I just mailed mine (registered mail) and didn't fax them. You should mail it too, in addition to faxing. I should probably have faxed mine also - just to cover all bases. I have never heard anything back from anyone about it, although I didn't expect to.