Charade Turbo HR S/R

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I have recently lost my son and need to get his car sorted out.
Would anyone be able to advise me please?
The car has been garaged for a few years and is currently sorned.
It was running and driven into the garage at the time.
I think there is a spare engine with it and also some leather seats to replace what is in the car.
There may well be other spare bits and pieces.
It did have quite a bit of work done on it prior to being garaged.
The problem is, I do not have the keys or log book.
If I was to sell the car, would it be better to go on and get a replacement log book (putting another owner on the list) or wait and let the new owner get it?
How big a problem is not having the keys?
Is there a fairly easy and quick solution to that or will it be a major piece of work?
Any help will be very much appreciated!