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Floor Boxes

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Looking into a problem that has appeared.  I have a concrete slab on 9/16" form deck (3" total thickness) on bar joists at 24" o.c.  The Electrical Engineer has informed me that he is required to use floor boxes ( see model FL-500P) for electrical.  These boxes are approximately 12"x10" in plan and 4" deep.  The support steel is already designed and I am trying to find a cost effective solution for these boxes that will now penetrate my floor without adding a large amount of weight (aka increasing slab thickness).  Fire protection is not an issue per the architect.  An idea that has been tossed around is to use a typical 14 ga sump pan that will be used as a form and reinforce it with rebar.  I do not see how this issue has not come up but all my searching has been for naught.  Is typical practice to increase the thickness of the slab for floor boxes?