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You are right, the 2 front guide wheels have 4 bearings each, so this makes 12 x 623 ZZ bearings.
I have bought more than needed, and it was the only picture (https://www.youtube.com/watch?v=LmtvaULC_Ls&feature=youtu.be&t=138) I took with all of them, before starting the assembly. Sorry for misleading...