I offer here a Fairphone 2 with an Indigo Slim case.
I bought it secondhand to test it. My daily driver is also a Fairphone 2.
This FP2 is from December 2016, has the old camera modules (8MP Back camera & 2MP Front camera). The battery is over 3 years old but still works well.
Normal traces of use can be seen on the phone.
The Fairphone has two flaws.
The primary microphone sometimes has a loose contact. It almost always works well, but sometimes the voice sounds muffled. If you press on a certain area on the slim case, the sound is good again.
Most probably, you need a new bottom module.
The display module suffers very slightly from the usual weak white spots - only visible on a bright white background.
At the moment Fairphone OS is installed on it. I can also install other operating systems like Fairphone Open OS, /e/ OS, Lineage OS, Lineage OS with microg or Ubuntu Touch from UBPorts on it if you want to.
Suggest a price. We can discuss about the price.
Located in South Germany.