running Cron job in Plesk

I have a script to delete unwanted cookies from some Curl jobs we are doing

find /tmp -name 'CURLCOOKIE*' -print0 | xargs -0 rm

this works great when I am logged on as root in the shell, now I have to put it into a cron job in Plesk.
When I do that it does not work. I think the directory structure is the problem but am pretty new to linux so I am not sure. I login as admin into plesk.

am I missing something or looking in the wrong directory here? No errors are being thrown. But when I list the /tmp dir in the shell the files are still there. I have the cron job set to run every couple of minutes for now just to see if it works and I have it email me any cron messages. Would set the cron up from the shell but the boss wants to see it in plesk.

Thanks in advance for the help!