Not being a Mac user, I'm going to guess that MacOSX::File::Copy is shipped with the perl that comes with MacOSX. And that all the rest of your modules that came shipped with MacOSX are also in /Library/Perl and/or /Library/Perl/darwin.
The /System/Library/Perl and /System/Library/Perl/darwin directories hold all user-installed modules and user-installed darwin-specific code (whether that's modules or compiled XS code).
This is little different from the unix platforms that have a "site_perl" path for user-installed modules (and, on some linux distros, a vendor_perl path for vendor-supplied modules, which is where modules that are needed by the vendor applications would live).
Update: As per below, I guessed backwards. Well, I did say I wasn't a Mac user :-) Either way, the reason for the two "darwin" directories is for this separation of what comes with the perl distribution vs what is user-installed.
In reply to Re: Mac Perl Package Question
by Tanktalus
in thread Mac Perl Package Question
by RobertJ
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