Are we sure that this trash can isn't a secret agent who is trying to collect fingerprints? It's the perfect plan. No one would ever worry about getting printed on that trash can, but then BAM! The cops are at their door. For what crime, I have no idea. Really though, you can't say that something is fingerprint-proof. Everything can get fingerprints on it if the person's hands are dirty and greasy enough. I'd argue that most of the times when you're coming into contact with a trash can are the times when your hands are already dirty.
I regret ever getting fingerprinted. I had to do it for a job and now I'm in the system. I don't know why that worries me, but it does. I'm worried about my fingerprints being in the system but not that my bank password is 123456.