Fannie Mae Property - 3 week restriction on investor offers?

[Aaron K.]

Quick question.  A Fannie Mae Homepath property popped up near me.  My realtor says I need to wait 3 weeks before we can make an offer as an investor.  

1) Are offers during the initial 3 weeks limited to first time home buyers only?  If not, who is that period restricted to?

2) How do they verify that offers during the initial 3 week period are actually being made by the restricted group, and not an investor?  In other words, what prevents investors posing as home buyers to get an early offer in?

Thanks!