We present updates for two ancient Egyptian diagonal star tables on coffins A1C and S2Hil. A1C reveals a new triangle decan, H3t s3bw, which brings the total number of triangle decans to 13 and the total number of unique triangle decans to 12 (because of the duplication of nTr D3 pt). We discuss its relevance, why it has likely remained hidden for so long, and why it may have been lost on other star tables. S2Hil is re-examined with new photographs provided by the Roemer- und Pelizaeus-Museum, Hildesheim. We find several striking features of this table that make it unique among the current collection, and also present more information of this table not previously identified.