Instructions should say: remove each one from the BOTTOM of the stack, it's much easier. These were for my parents' apartment in NYC, which had already been treated. We put them under chair and sofa legs in the living room, and under wheels of the bed frame in the bedroom. None appeared in the ones under the bed, but we got a few in the OUTER ring of traps in the living room. That was a surprise to us. Made us look hard, we found a place that had them and had not been treated first time (a fabric seat on a kitchen chair - which we promptly discarded) and had the exterminator back the next day to re-treat, this time including the remaining kitchen chairs. So, they served their purpose as indicators, but as the instructions say they are NOT by themselves a control method. In this case, going from kitchen to bedroom could bring bugs to the bed (which were in barrier covers) despite the interceptors under the bed wheels.
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