Non-crowing rooster?

[StarLover21]

Interesting add advertising non-crowing rooster...I'm not interested in purchasing him (too risky), but do you think that this is actually true/possible?

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http://dallas.craigslist.org/ftw/grd/3197927231.html

(in case it gets taken down I'll post it below)

I have a rooster that can be kept in the city. His crow is messed up and he remains silent when trying to crow. If you live in the city or want a breeding pair of chickens w/o the rooster crowing this is your deal. The rooster is gorgeous and the pair of them are extremely healthy. They are a dominique breeding pair that have been kept together for several months. Hen is 6 months and rooster is 1 y.o. $40 for the pair.

 

[sourland]

Possible that a naturally occuring injury to his vocal cords may have left him silent. Probable?