I was due to report to Immigration on the 5th of June 2011(as stated on the paper slip stapled in my passport). I have, however left the country and returned on the 29th of May 2011. The Immigration officer stamped me in and left the paper slip in my passport (90 report on 5th of June 2011). From my understanding, I can disregard the slip of paper and count my 90 days from the moment I re-entered the county on the 29th of May 2011. Am I right or wrong? Why do the immigration officers not take out the slips when not needed. Thank you for baring with my newbie-ness on what should be a simple matter.

The 90 days start on the day you returned.

Because that is your receipt for last report and will be removed when you make your next report or included with a mail in. When they see the date they will check your passport and find you departed/arrived prior to it and all will be well.

Thank you!