I may be misunderstanding your question but no, having NBOME blotters in the same room as your device will not contaminate it. You were very wise to throw those away. I truly believe that my one NBOME experience almost killed me. I was a fool and insufflated 4-5mgs of 25B and it sent me into an unresponsive state for 2-3 hours during which I pissed myself. When I woke up I was in the grip of the worst mindfuck of my life, I truly believed that I had died and my house was purgatory. I proceeded to thrash about my house trying to escape by jumping out of windows for a couple hours. Sorry get off topic, figured I'd share my cautionary tale.