How to ask Buyers to Leave Feedback on Ebay?

Some buyers do not leave comments. Some moved to the afternoon. Usually, the invoice I send with my products I have to include a note saying:

Thank you for your business! Once they have left no comments for this article I know you are satisfied with your purchase and all is well. So to leave feedback on eBay. If you are in any way unhappy with your purchase, please contact me immediately ..... @. com

Consider this

I realized early on that e-mails and asking that sometimes bothers them. They can leave comments that do not want.