I am really wondering what my DJI Phantom 4 Advanced + is worth, bought it a year ago, it's working fine with some minor damages, but works perfectly, how much would it be worth?

Minor? Might be considered mighty major, or a headache, to others.

Please post a pic of the slight carnage... grin

If you share your interest in selling her here:
https://phantompilots.com/forums/classifieds.9/
You may get better response.

Consider what a refurbished P4A + model would garner.

RedHotPoker

Hi, Thanks for the inquiry. Are you about to sell your Phantom 4 Advance+? Please let us know. Thank you for the support.

For a damaged drone you wont get very much at all.
I would prob be willing to pay somewhere between $600 - $800 aussie $
That would be max i certainly wouldnt pay more than that.

on the landing gear a plastic plate about 1cmx1.5cmx fell out once i was flying

and i am pretty sure im about to sell it, i litterly don't use it at all, i really wanted it but regulations have kinda stopped me from flying it too, i saved up for it and im only 13,

not to mention i was kinda disappointed with it's range, 400-500m, i know 3500m is meant to be over open ground, but even over an ocean i managed only about 2.5km

MrDankYT Posted at 2018-10-1 21:46
not to mention i was kinda disappointed with it's range, 400-500m, i know 3500m is meant to be over open ground, but even over an ocean i managed only about 2.5km

That little plastic plate usualy only comes out due to impact of some form.
So having said that not many experienced people would buy it of you but you may find someone thats just starting out in the drone community that would be willing to buy it but as already mentioned your not going to get much for it.As for its range you should be getting far better range than that, out to posibly 4-5 klms over flat unobsturucted terrian.

I've seen P4A+ drones sell on Ebay UK for around £800 - though it depends on the condition and accessories you're selling with it.