The only mention of G 7624 found, to date, is in George A. Reisner's unpublished manuscript for The History of the Giza Necropolis, Volume II, Appendix B: East Cemetery (Cem. 7000), page 82. The manuscript is stored in the Art of the Ancient World Department Archives of the Museum of Fine Arts, Boston, Massachusetts.
It is, presumably, a rock-cut tomb just north of the the chapel of Meresankh III, G 7530-sub. This is either an otherwise unrecorded tomb, or (less likely) a mistaken reference for G 7524.