From: "Ben Goertzel" 
> [...] but still the records
> could be kept somewhere, 
> and one can ask what would happen 
> if the records were kept somewhere else [...]

Not sure, but the quote below - about the information
'in principle' - might be helpful.

"The superposition of amplitudes is only valid if there
is no way to know, even in principle, which path the particle
took. It is important to realize that this does not imply
that an observer actually takes note of what happens.
It is sufficient to destroy the interference pattern,
if the path information is accessible in principle from
the experiment or even if it is dispersed in the environment
and beyond any technical possibility to be recovered, but
in principle 'still out there'".
- Anton Zeilinger, (Rev.Mod.Phys.,1999, p.S-288)

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