I believe this is how it works.

You go to the Police with the evidence you have of stolen goods ( are they your items you've recognised? ) , and then if the Police need to follow up,  they contact eBay,  only then may eBay relay personal contact details.

@anothersimpson20 

1. Preserve evidence immediately

• Take screenshots of:
  • The full listing
  • Item number
  • Seller username
  • Photos
  • Description
  • Price and location
• Save the URL of the listing.
• If the item has a serial number, unique markings, receipts, or photos proving ownership, gather those as well.

2. Contact the police

Report the listing to the police force handling the theft investigation (or your local force if you have not already reported it).

Provide:

• The crime reference number (if you have one)
• The eBay item number
• Screenshots and links
• Evidence that identifies the item as yours

The police can request information from eBay as part of an investigation.

3. Report the listing to eBay

Explain that you believe the item is your stolen property. Include:

• The item number
• Your crime reference number
• Any unique identifiers proving ownership