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The ZL1's are know by the vin and most are known cars with ownership history. Not many clone builders have the ability to get a vin tag made. Trying to pass off a fake ZL1 is probably the hardest to do for Chevrolet cars.
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No longer true, they are for sale now and often on Ebay (Blank VIN tags, that they will "stamp" for you after the auction). I got stuck with both fake VIN, CONVIN (firewall piece), fake Trim Tag and Fake stamped L78 block recently for 7k. Block was somewhat obvious in person, tag and vin's fooled everyone but Kurt and Jonsie.