If you are planning to “goof” on the census (why not) it’s a crime to not fill it out or give willful wrong answers.
A better strategy is to claim the 5th amendment when/if the census bureau asks about your form, and they will ask. Remember its a crime to refuse to fill it out or give wrong answers.
Census: Did you return your form, we didnt get it?
You: The post office may have lost it...
Census: We didnt get it...Please fill it out again
You: I take the 5th
Census: What? Its a federal crime to not answer or give wrong answers. Did you fill out the census?
You: I take the 5th.
Remember, to convict you, they must have evidence that you didnt fill out the form or gave wrong answers. DONT GIVE THEM THE EVIDENCE.
So this time I just wrote “Prefer not to answer” on the offending questions...