Got my first call back!!

[Kyle Critchnau]

I sent a batch of 150 yellow letters out at the end of October (mailed on October 31, thanks again @Michael Quarles for the hookup) to probate personal representatives, and got my first call back! The caller (I'm guessing the PR's husband, it was a man's voice saying he was calling for her) said that their son had moved into the property and they weren't interested in selling. 

So here's my question: should I return their call, even though they said they wouldn't be interested in selling? I don't want to bother them if they're not interested (the guy didn't sound upset on the message, but I don't want to change that) but at the same time I'm rather excited and want to see if I can make an opportunity out of it anyway (i.e. saying, "if you know anyone else that is interested in getting rid of a property, have them call me"). What say you, BP'ers? Thanks in advance!