40 acre, have you been able to heft the hives at all to gauge what might be left, or the weight remaining in the hive?
like perry said, i would give them insurance in the form of fondant, winter patty, or sugar to carry them through until syrup can be fed if need be, and yes they will take it even with stores left in the hive. they may have some stores on the outside of the box, or bottom, but will take fondant, patty, sugar, above them before they move from side to side to consume any honey stores and bees will not move down to consume any stores if there.