For sale sign, not on mls, agent not replying to emails..

[Marco Aceves]

Good evening folks,

I saw a property that had a for sale sign in the yard. I went on Zillow, Realtor, Red Fin and I could not find the listed property. I went ahead and emailed the agent asking for more information and have not heard back. What would ya'll do to get in touch with someone if the agent that is on the for sale sign is not replying?

Thanks!