How do you use counterfeit in a sentence as an adjective?

Here are some examples of using "counterfeit" as an adjective in a sentence:

* The detective discovered a counterfeit $20 bill in the suspect's wallet. (Describing the bill as fake)

* She was wearing a counterfeit designer handbag, easily identified by the poor stitching. (Describing the handbag as fake)

* The market was flooded with counterfeit goods, making it difficult to tell the real from the fake. (Describing the goods as fake)

* He used a counterfeit passport to cross the border. (Describing the passport as fake)

* The artist's work was so good it was almost indistinguishable from the original, creating a counterfeit masterpiece. (Describing the artwork as a fake replica)