Strangers in the warehouse

I was walking around in a large room like a warehouse.  Everything was all in white but the lights were very low so it appeared to be dark.  There were rows of boxes that were about 5 feet high arraigned so that you could see over them but not walk around easily.  There were three teenage boys walking around looking at things.  I questioned them and they said the door was unlocked so they just walked in.  I knew the door was locked but could not figure out how they got through so many locked doors.  They left and the cleaning lady came in.  I told the cleaning lady about the boys and she showed me a bunch of screws that they had left behind.  I gathered up all the screws and counted them to make sure we had them all.  I placed them in a bowl on the floor.  As I was walking out I accidentally kicked the bowl and the screws went all over the floor.  The cleaning lady helped me pick them all up and recount them.