I am a Sprint Rep and from my experience, no you will not be affected. Since this device is now tied to your account, and hopefully there wasn't a similar situation with an insurance replacement being sent in, you should be fine. The only thing I could see worst case scenario is if the original seller kept log of the ESN and checked it daily to see if it was removed from an active status, which can be done by going into any store and having them check an ESN to see if it is bad or good. They then can attempt to reactivate it through their Sprint.com account after it becomes inactive off yours and possibly try to do an insurance claim to get a "lost/stolen" replacement. Tedious....but who knows with people now a days.