I thought it was pretty obvious. They
are the source loops used. I can't exactly prove it but it's pretty clear when you listen to them.
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At the end of the day these are fairly generic sounds. They would be easy to replicate, and easy to disguise.
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You might be too used to acoustic instruments, but I know for sure that these are the loops used. They aren't very generic, they're pretty defined.
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I've listened through some AO tracks, and I don't really see any places where they fit.
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http://youtu.be/pV_7eoNkUVA?t=7s and also the one Holy Sock posted.