All very helpful information. Thank you so much for sharing your findings.And the HPAI elimination pdf says what and how to clean
and
"After cleaning and disinfection, you site must stay empty for at least 21 days. During this time, animal health officials will return to collect environmental samples from different areas of your farm. These samples will be tested for HPAI to ensure the virus has been eliminated... Test results typically take 2-8 days for you to receive them."
Again, it seems to have more to do with getting reimbursed for the costs of the clean up than with anything really strong-armed.
It also gives us an idea what we might do before getting more chickens if our precautions fail.