When a hen gets broody, it doesn't matter if there are eggs in the nest or not. They'll act like they have eggs, and sit tight. Don't waste your perfectly good eggs, trying to induce broodiness. they brood or not, depending on the hormones and breeding of that particular hen.
Have you read up on the problems that can occur with shipped eggs? You'd be much better off trying to find some local eggs to hatch. Shipped eggs often have ruptured air cells, which makes them harder to hatch. The general consensus seems to be they they have a better chance of hatching either in and auto-turner with cups that allow the egg to sit upright (big end up) and near upright, a good deal of the time, or t hatch in carton bottoms so they can be gently tilted side to side, propping on end of the carton, then the other, etc. Eggs to hatch under a hen need intact, normal air cells, usually, (there's always somebody who managed it despite the odds) to have a good chance to hatch.
But sometimes the shipped eggs come through intact, air cells and all, in which case you could get a great hatch under your hen. Let them rest, big end up, at room temp, about 24 hrs. before you put them under her. Candle first, for cracks. Mini-cracks that may not show under normal light will glow when candled.