If you are going to be a displaced receiving/claims associate you will be terminated on December 7th if you dont get another position with in a club. The 15 day period refers to how long you have to sign and return your paperwork for severance. So in other words you have 15 days from 12/7/18 to submit the above packet. Failure to do that within the 15 days could cause you to lose severance or the company assumes you don't want it. So basically be sure to return signed packet by 12/22/28. Also you dont give notice. GMs have info on how all this should be handled. They are to request your severance packet a week ahead of your last day.
Bumped from @VXj7NlS-jay for info.