What does the 4th Amendment have to say about this? The guiding philosophy at the time 4A was framed is "the public is entitled to every man's evidence".
They're towing cars. You think they bring them back 30 minutes later and leave a friendly note? Unreasonable search and seizure. I'd say the seizure of property worth tens of thousands of dollars as evidence for a crime the owner was not involved in is pretty unreasonable.
They're towing cars pursuant to warrants issued when the owners of those cars can't be identified and the cars contain evidence of homicides. "Reasonable" search and seizure is almost literally "whatever a judge decides".
