There is a paper in German:
On Andrea Byrnes' Facebook page, Kento Zenihiro comments:
They found about 100 examples of a cone, which had been registered as # 66 by Norman de G. Davies and M. F. Laming Macadam, in the heaps of the collapsed facade of the recently-found Saff tomb K10.1 which is located on Dra Abul Naga (They have not shown the map so I do not know the exact location but it must be near TT 232 and the pyramid of Nebkheperre-Antef).
Note that M. Betro and P. D. Vesco working at nearby tomb (TT 14) had already identified this cone to be of that Nebamun (Cf. Betro and Vesco (2010). Un cono funerario dall'area di M.I.D.A.N.05 a Dra Abu el-Naga e il problem della tomba perduta di Nebamon. Egitto e vicino Oriente, 33, 5-16).