Originally Posted by Tim the Enchanter
There is no prologue in the Harry Potter series. I assume you mean the Epilogue (Nineteen Years Later)?
I think that after more than two decades of rampaging through the forest, the Anglia would probably be rust-coloured, with very little of the turquoise paint left.
For that matter, the tyres would probably be cracked and flattened, and I doubt it would even be running any more. With no oil changes, coolant or petrol refills, spare parts, and other tune-ups, the Anglia would have probably broken down and died at some point. Yes, it is a magic car, but it still ran on an engine, and engines need to be kept in good shape.
So by the time of the Epilogue, the car would be dead, rusted, and probably have plants growing over it or inside it. And yes, you might find some animals living inside, magical or mundane.
But I doubt you'd find Bowtruckles. They're supposed to live in trees that bear good wand wood.
Tim the Enchanter