When you pass by a lost Chipolo as a Chipolo user with the app active on your phone, the app will send an anonymous location update to its owner by using the Community Search feature.
Please contact Chipolo Support via help@chipolo.net if you're not (yet) part of the Chipolo Community and we'll assist you further. Thank you in advance!
You can find the Chipolo app for iOS in the Apple App Store and in the Google Play Store for Android devices.