Replying to ReMounting

Ok I recently bought a pair of used skis, and I had to get the binding re mounted because my boot is so long. My brother picked up the skis for me, and the shop mounted them about 4cm further back than i asked. I know that they have already been remounted twice. If I have the shop lift the binding slightly to see if i can move it forward, will they not be able to put the binding back in those holes if there is nowhere further forward to mount?