I agree that the system does not record the importer information at all, however, I think the last half of the statement is potentially incorrect.
Pages and spaces do NOT become owned by the importer (at least in 6.13.8).
When we did our migration this past week from one Confluence instance to another, the users who create or edited pages were ported over as "unknown user" as well as displayed what the user's username was in the other instance and the last modified date. Permissions wise, if no user mapping is done, they simply will not show up in permissions and potentially leave an imported space with no users or admins at all.
An example of the info on a page we moved from the old instance to our new one:
I apologise, you are absolutely right.
The last time I did a migration myself, it was a 6.4ish version, and more importantly, had significant customisations. Including something that deliberately set the page author on import.
That is an explanation of why I'm wrong, but not an excuse, because I should have checked before I said that stuff about ownership.
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