Of course China will return it.
Right after they take it apart, photograph its parts, map all its PCB traces, identify all the parts, copy its firmware and reassemble it (that last part is optional).
And in a year at most the US can buy a comparable version at half the cost from China.
Same thing happened when that US spy plane had to make an emergency landing awhile back (after colliding with a Chinese fighter jet). China returned the plane, in crates. I hear the crew threw all the sensitive stuff out while the plane was over the water.