I'm not sure if the replacement you showed would work on your shell due to the redirection. What I would try first is this:
system('/bin/sh', '-p', '-c', '-e',
"/usr/bin/cp -f $version/$obj $dest 2> /dev/null"
)==0 or die "system: \$?=$?";
I've added some error checking. Note that this suffers from potential security issues if those variables contain any unchecked user input! (And potential quoting issues.) I wrote more on that topic, and how to run external commands using modules, here.
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