To visualise how the missing slabs would fit back on to the pre-stretched comet, the following drawing was made which involves just cutting out the neck, fitting the head back on at the shear line, and placing slabs back where there was evidence they have come from. Also shown is a Navcam image where the craters are evident as missing slabs. Drawing by A.Cooper. Image courtesy of ESA Navcam - All annotations by A.Cooper.
Several "missing slabs" have had their own blog post detailing evidence of how they came to be including.
The amphitheatre slab A.
Slab B Babi
Photo credits: Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO