Where to find current wallpaper file?

[GrandeCube]

Hello there.

I have Sony Xperia M2 for over 2 years now and its doing quite well. I've never had better smartphone but thats not the problem obviously. Long time ago when i was in Bulgaria on my vacations i took a wonderful photo (with my old phone) 
Since then i changed my phone 2 times and somehow managed to not remove this photo, i always set it as my wallpaper when i get a new phone. Soon i am about to get myself a new phone and i wanted to make sure that i still got this photo and i didnt find it (i must have removed it by accident) but i still have it as my wallpaper. Here comes my question. Where can i find in storage a current wallpaper file? 

My android system version is 5.1.1

Sincerely, Cube

[MarlonUk1]

unfortuntely you can not access the system aspect of the device without rooting your device.

did you check if the image you are looking for is present from your social media? it might be that everytime you add your accounts to the device , it syncs the photo.

[GrandeCube]

I'm a type of not so social person, i dont have any social accounts that have acces to my gallery. Is there any other possible way?

[MarlonUk1]

how about when you open google drive or google photos?

your positive that it is not one of the stock or preloaded images?