After you load the module(s), print out the %INC global. This will tell you the locations of the files which have been included via use or require; for example, try perl -e 'require CGI; use Data::Dumper; print Dumper(\%INC)'

perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'