As a business you have to issue invoices and you also have a responsibility to stop obviously criminal behavior.
A car dealership can’t sell somebody a Lamborghini if they want to pay with crumpled $20 notes. An art dealer can’t buy a Mondrian that the seller claims they found in their granny’s attic.
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.
