Sad Sack Armed Forces complimentary copies #HD1-HD40

I made three interesting discoveries today. I decided to finally tackle the 40 issue run of the Sad Sack Armed Forces complimentary copy series that are numbered HD1-HD40. I have found that each corresponding issue is not chronological; I have found the cover for HD18 is altered from Sad Sack #100 for obvious reasons, and I have just about concluded that HD12 does not exist due to me not being able to find a copy and also a person who goes by the handle "Marvelmaniac" on the CGC forum has asked about this particular issue with no success. Mycomicshop does not picture a cover, nor does Grand Comics Database. Does anyone had a copy of Sad Sack HD12?

Here are the corresponding issues for you completists out there:
HD1 - 57
HD2 - 67
HD3 - 69
HD4 - 68
HD5 - 74
HD6 - 75
HD7 - 77
HD8 - 81
HD9 - 83
HD10 - 84
HD11 - 87
HD12 - exist?
HD13 - 94
HD14 - 55
HD15 - 56
HD16 - 98
HD17 - 99
HD18 - 100
HD19 - 104
HD20 - 105
HD21 - 102
HD22 - 109
HD23 - 70
HD24 - 71
HD25 - 72
HD26 - 78
HD27 - 106
HD28 - 108
HD29 - 110
HD30 - 112
HD31 - 117
HD32 - 113
HD33 - 119
HD34 - 120
HD35 - 121
HD36 - 125
HD37 - 124
HD38 - 126
HD39 - 127
HD40 - 128