I have an iphone 4s now and heres the story?

So I had a 5s and I lost it, so I didn't want to spend more money on another 5s just to end up finding it, so i bought a 4s, and still can't find my 5s. The 4s is alright, except i have 1 question. All of the wallpapers in the settings are gone that I had on my 5s, there were more built in wallpapers on my 5s, why?

The iPhone 4S probably doesn't have the same iOS version that your iPhone 5s had. You'll need to update it. Just make a backup prior to doing this.

Go to Settings>General>Software Update

Because it's their way of bribing you to get a new phone. There are heaps of cool wallpapers on new phones and bad ones on old phones