How many demo copies are pressed of a 45?
Exactly how many Radio stations were operating in the U.S. at the time? Who else would have received promo's?
1000 copies sounds a lot to me - wouldn't they try it on the local market before commiting to a national push? - this was an unknown artist, not a Marvin Gaye or Stevie Wonder.
Both 'known' copies came from people related to Motown in a roundabout way - and no copies have been found 'in the wild', which surely points to any addition copies pressed being destroyed?