I won this ammo can at a Back to the Future event back in October 2015. (Thank you Ginny & Steve.) But I wanted to find a good place to hide it...I think I may have done it. So look for the flux capacitor and you will be rewarded with a smilie! The coords may not be spot on, but use your geosenses and you will be successful.
Ernyyl? Gurer'f bayl fb znal jnl gb uvqr na nzzb pna... Guvf bar vf abg va gur ebpxf, ohg jvyy oyraq va jryy va gur Fcevat naq rneyl Fhzzre.