Hi pass2012, it's weird that they wouldn't give you the eligibility assessment form. I'm wondering if this was a new development, and they started refusing to process rather than rejecting applications based on the PER email really recently. All the same, I think mike5182 just very recently did the same if I'm not mistaken, and he got the eligibility assessment form which he had sent for appealing, and I think he did this only a week ago. Maybe you indeed should try different offices from different cities. We need not be eligible for permanent residence, but rather, eligibility to APPLY is enough, which the PER email confers (unless they have changed their regulations). I did it on the Waterloo office, and so did mike5182. Hamilton offices may just need educating about the issue.
PER is indeed just the first scan, but starting MI-2, the CIO issued positive/negative FINAL determination of eligibility as well, which was what Approval-in-Principle really means (unless one is trying to play pedantic with the definition):
The PER email states
I suppose one can probably make the case that the PER email has just granted positive eligibility for further processing (hence, not yet processed), whereas approval-in-principle requires the application to have been processed already. Though another way to look at it would be to refer to our eCas status which says 'In Process', implying that the application is currently being processed.