Neither of your examples seem obvious or objectively criminal, or uncontroversial for that matter. If you pull back from Lambo to a Civic, is this still obviously criminal?
classifying suspicious transactions is a weird and dangerous path to legislate.
Domestically, cash above $10k is already subject to a reporting requirement, a new Honda Civic is $22k, and that much cash has been deemed suspicious due to the war on drugs.
