1) Use the Contact Rules and Safety page, found here:To report shill bidding, simply use the drop down boxes and find the appropriate violation, such as: "Member offences", then "Selling offences", and then "A Seller is bidding on their own item"

2) You can still use eBay's direct e-mail, which is safeharbor@ebay.com

3) When forming your reports, it's important to include as much evidence as you can. This includes all user IDs, auction numbers, and miscellaneous evidence to help your report.

4) Keep the details because if safeharbor don't see enough evidence the first time around, you can use your initial report plus any new evidence should the behaviour continue.
Article by bearalltosee