In addition to the original Latin inscription, the tombstone contains a text that has been added in the nineteenth century.
In addition to the original Latin inscription, the tombstone contains a text that has been added in the nineteenth century. The number C.Bb3 corresponds with the catalogue of Leemans. Beredeneerde beschrijving der Asiatische en Amerikaansche monumenten van het Museum van Oudheden te Leyden, 1842, p.77. Below, in another hand, we read the inventory number In. 2., which probably corresponds to Janssen's 1842 catalog of Greek and Latin inscriptions. In his section of inscriptions without a drawn copy, this tombstone is number 2. In his preface on p.7, Janssen explains why the three inscriptions in this section (titled Inscriptiones in tabulis non delineatae) are not covered: as Punic inscriptions, they fell outside the collection of Greek and Roman antiquities proper. In addition another publication of these inscriptions was on its way. With the latter, Janssen probably refers to Leemans' catalog, which indeed contains a drawing of the inscription.
Many of the Punic antiquities in the museum were collected by Jean Emile Humbert, who discovered and excavated the ancient site of Carthage. See here for more information on Humbert and R.B. Halbertsma Le solitaire des ruines. De archeologische reizen van Jean Emile Humbert (1771-1939) in dienst van het Koninkrijk der Nederlanden, 1995, Leiden. It is not really clear whether Humbert was involved in the acquisition of this particular tombstone. Leemans declares in his catalog that the tombstone was "coming from the ground of ancient Carthage, and acquired in 1835 for the museum from Sir J. Nyssen in Tunis.""Afkomstig uit den grond van het oude Carthago, en in 1835 voor het museum van den Heer J. Nyssen te Tunis aangekocht." The identity of J. Nyssen (or Nijssen) is not clear to me, but he most probably was a member of the family that formed a sort of "consular dynasty" in Tunis from 1756 to 1873 (Halbertsma, 1995, p.20 n.19). Humbert had been married to Thérèse Nijssen, the sister of consul Antoine Nijssen. He had a difficult relationship with other members of the family, especially his brother-in-law César Nijssen, who became consul after the death of his brother Antoine in 1825 (Halbertsma, 1995, p.63-4).
Other sources, however, state that Humbert did send the tombstone to Leiden. Janssen notes that it was "sent over by Humbert from the northern coast of Africa" "ex Africae oris septentrionalibus ab Humertio transmissi". The Corpus Inscriptionum Latinarum contends that it was found around Carthage and that Humbert brought it to Leiden. The latter is highly unlikely, as his official appointment ended already in 1830. The museum did buy some antiquities from him after 1830, Halbertsma, 1995, p.179 n.63. but it is highly unlikely that this tombstone was part of these later acquisitions. On his last visit to the Netherlands in 1834-1835, museum director Reuvens bought a few antiquities from Humbert, but no mention is made of a tombstone. Halbertsma, 1995, p.138.