I believe that there are two versions (trade dress and virgin) of the Dawn McTeigue cover missing from Core. There were leather covers limited to 10 copies for EACH. See screen capture below.
For the trade dress, you should be able to simply replicate the entry for 1AW, 1AX or 1AY and for the virgin you should be able to simply replicate the entry for 1AZ, 1BA or 1BB (based on current numbering - if you add the trade as 1AZ, please adjust accordingly) and then change description to mention leather covers and change limited to 10.
Please let me know if you require any additional information.
