For serials only:
Use a local technology shop, find the item you want to SE and take a photo of the serial number if it's located on the box
For serials and photos:
Search for the item on facebook marketplace or your regional alternative, or eBay but it's more difficult and make sure to edit the photo: e.i turn it around a bit make it a tiny bit smaller and remove the exif data and put in some of your own if you can.