I'm sorry, I don't know what you mean by "theater".
All you need to know is that you are SAFE.
You had NO RISK.
Then you didn't have a risk and do not need to test.
Getting tests done at a lab is always preferable. At 28 days they are "almost" conclusive, But some, including me, always advise testing at 12 weeks post exposure too for a conclusive result.
Will you tell us what your low risk exposure was ?