That's really weird... the latest edition must have all the info from the previous one. Are you sure you went through all (whatever) pages? And how many pages in both versions, BTW? Did you order notes directly from CIC or through someone else?
The information is never deleted from the notes, there is simply no way to do so in their system. It can only added. I.e., in addition to "Eligibilty - In Progress" record there must be one more (if they made up their mind): "Eligibility - Passed" (or "Not Passed"... but hopefully this is not your case). And full interview trascript must be there as well (how accurate - this is a different story). ususally close to the end, last few pages.
"Assingnment" simply means that you application is reassingned to another officer for further processing. This doesn't matter much.