12 of Toronto's draft picks in 2011 didn't sign until August last summer. This is relevant, because it means any of these players could be the PTBNL who would complete July's trade between Houston and Toronto.
Signed on August 12, 2011
Jacob Anderson, OF, 1st Round Compensatory
Tom Robson, RHP, 4th Round
Brady Dragmire, RHP, 17th Round
Derrick Loveless, OF, 27th Round
Signed on August 14, 2011
Dwight Smith, OF- 1st Round Compensatory
John Stilson, RHP- 3rd Round
Anthony DeScalfani, RHP- 6th Round
Mark Biggs, RHP- 8th Round
Signed on August 15, 2011
Daniel Norris, LHP- 2nd Round
Christian Lopes, IF- 7th Round
Matthew Dean, 3B- 13th Round
Signed on August 17, 2011
Kevin Comer, RHP- 1st Round Compensatory
NOTE: By rule, a player cannot be traded until a full calendar year after he signs.
NOTE: After getting these dates from the Blue Jays' website, I have realized that the signing deadline last year was August 15, so Comer had to have signed earlier.