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Josh K.My understanding is that the SGC slabs are a tad too wide for the Roop boxes but Im not positive since I dont own one. The boxes are essentially one outer box with a lock with four small removable boxes/partitions inside. The SGC slabs may not fit in the four inside boxes - but they can be removed and then you should be able to fit at least three rows of sgc slabs rather than four as designed.
Can someone who owns one confirm?