eBay app uses AR to help sellers select the correct shipping box size
The auction site says that the feature will work on compatible devices only, but has not released the names of these handsets. If this does require Google's ARCore platform, eBay sellers with any Pixel model, the LG V30, the Samsung Galaxy S8/S8+ or the Samsung Galaxy S9/S9+ should be able to use AR to find the best box size.
Besides adding the AR shipping box sizer, the latest update to the eBay app for Android includes a fix for an issue that was preventing the app's night theme from working correctly. The app can be found at the Google Play Store by clicking on this link.