>8 made of shells = Ate Military shells
>6 made of rocks = Rock 6 o'clock
>47 made of slate = PDJT was slated to receive
In short:
Ate Shells, Rocks 6, Slated 47.
Whether the 8647 was real or photoshopped, effort was made to differentiate the materials. Even the 86 and 47 were slightly separated because even a random person taking the assignment is a win for them too. But it was more nefarious than this because of the distinct materials. Shell, rock, slate. Miracles and 911, if anything bad happened, we all would have been totally demoralized, think about it.