You are using HTTP::Cookies which is a generic container for cookies. If you want to read cookies that already exist on your system then you need to use a specialised container.

It looks like you are using IE. Try HTTP::Cookies::Microsoft

I find the IE treatment of cookies to be more difficult to work with than the Netscape compatible method supported by Firefox, Mozilla etc. I also find that Mozilla offers better cookie management features so I use it for development (while using Firefox for general browsing).

You would use HTTP::Cookies::Netscape to work with Netscape compatible files.