The warranty you bought from CPS for your product you purchased on eBay begins on the product's date of purchase. CPS warranty coverage will begin 30 days after the warranty purchase date.
For example:
Apple iPhone purchased on eBay on June 1, 2018
2 Year CPS warranty purchased on June 28, 2018
CPS warranty start date: June 1, 2018
CPS warranty coverage start date: July 28, 2018
CPS warranty end date: May 31, 2020
Unfortunately claims that occur during or prior to the 30 days post warranty purchase would not be covered under your CPS warranty.
Please feel free to contact CPS with additional questions at cs@cpscentral.com