Was the Injeel ever written in book form?

Is there any evidence that Isa (a.s.) wrote the Injeel in book form? Because it seems that Allah has already gave him the Injeel when he was a baby. > [Jesus] said, "Indeed, I am the servant of Allah . He has given me the Scripture and made me a prophet. > > Quran 19:30 Isa (a.s.) said this as a baby after his mother gave birth to him and took him to her people. So I was thinking that Allah put the revelations in his mind beforehand and the Injeel was never actually written. This whole time the Injeel was just memorized inside Isa's mind. **If the Injeel was actually a written text, don't you think someone would have found it by now?** Instead, people keep finding very old un-canonical gospels written by Isa's disciples. No one ever finds the actual Injeel or what some people call "The Gospel of Jesus". I could be wrong but I think the Injeel was in Isa's mind this whole time....not in actual text.