Much of Mozart’s music has reached us through secret sometimes unknown sources. These three quartets are no exception. We know approximately when they were released and where, as the publisher Johann André from Offenbach added them to his catalog in 1799. What we do not know for certain is who arranged them. However, the most likely candidate is André himself. He wrote about his musical prowess "I never became the creative artist, that I could have been. When I was younger, I composed well, but without guidance and direction; once I had begun to think for myself and had learned sufficient, then I was too old to revise my knowledge of basically, as only a child can."
However, only very little of the original quality of the music and the intrinsic vitality has been lost in transferring the original version in this quartet, Which speaks volumes for Andrés work. In general, opinions on arrangements can vary, but these quartets are in any case of enrichment albeit in another form, most definitely Mozart!