Best proof I had that the bike was mine was that I had the pedals in my pocket. I have MKS removable clipless pedals on a few of my bikes.
iridetitus, someone could have gone and claimed the bike on their own anyway since all they asked me to do was describe the bike. At the end the guy asked me for ID, but all he did was glance at it. Maybe the mere request for an ID would scare someone away though. BTW, I live in Forest Hills, right where the LIE and the GCP meet, across from Flushing Meadow Lake. Where is Forest Hills Park?