I found this in GC217NX "Peppermint Trail" in Scottsbluff, NE.
Now that I'm back home in Wyoming, I'm a bit confused; this isn't a 250-finds coin at all; the Micro Proxy with the tracking code is attached to a plastic Hello Kitty.
I'll go with the stated mission of visiting all 50 states, and will try to drop this in Colorado in the next few days, since I see this hasn't been there yet.