Nice find, thanks.

In the aftermath of the confiscations following Katrina, this federal law was enacted:

https://www.law.cornell.edu/uscode/text/42/5207

But, that's for anyone acting from federal authority, or federal funding. And it doesn't addresses sales, just confiscation.

Hopefully, someone will file a challenge quickly. We have a similar law in Texas, and it took a round of high profile slapdowns to get municipalities to start abiding by the law.