This Sonata could be G.11 ?
It has the same movements (although in a different order )
as mentioned on the Boccherini Complete list and Gérard numbers page.
1. Allegro (mi bémol majeur)
2. Largo (mi bémol majeur)
3. Tempo di Minuetto (mi bémol majeur)
No, this is a version of G.16 with the Largo of G.11. I controlled the incipits in the Gérard catalogue, and they correspond (Gérard even mentions manuscripts of G.16 which contain also the Largo which he lists under G.11)