You're right! I never knew or realized this till now ..
Nonetheless, I finally decided it was for the better to check that box off .. I don't want them to have any additional information such as the address I used to obtain my papers or where the PRC will arrive If and when they find out that I have landed.
Like Zardoz mentioned as a sponsor he could see that I landed , it now says " decision made" if he were to check and where is says permanent residence application status it now says " not available on the internet". If anyone were to follow up with my status however it would probably be my in-laws since they are the ones who with held my COPR papers and are in possession of the info on there needed to look anything up (aka UCI # ) and with that information they could have easily logged onto my ecas page.