The question of the extent of the involvement of native Egyptians in the formation of the Ptolemaic state is still not taken into account in studies on Hellenistic Egypt because the sources that could inform us on this subject are still largely unpublished. A corpus of administrative archives in ancient Egyptian and Greek, preserved in the Jouguet Collection of Sorbonne-University, in Paris, has been under-exploited due to the poor condition of the documents. The reason for this is that these texts were used in, and have to be extracted from, mummy decoration that is called ‘cartonnage’. In order to make this material accessible to the historian, major restoration work has to be carried out, which is the first objective of GESHAEM, The Graeco-Egyptian State: Hellenistic Archives from Egyptian Mummies. Moreover, because the texts had been cut up when they were reused to make the cartonnage, they consist of a myriad of fragments that have to be reassembled. A second objective of the project is therefore to create a software that will automatically make joins in the fragments and thus help the papyrologist reconstruct the texts. Once the fragments are restored and reassembled, they can be read, published and studied, with the objective of re-evaluating our view of the Ptolemaic administration in the 3rd century BCE. The originality of GESHAEM is also to pay attention, for the first time, to the decoration of the cartonnage and to make the first stylistic study of this which has hitherto been neglected in the field of art history.