Ok, I think I follow now.
So are you saying the group who bought those shares is not already holding any more than 3.13% of the shares ?
rationale:
Happy to be corrected, but if the person buying the shares already holds 5% or more, and the change of their holding is 1% or more, I believe a 604 is required to be filled out.
http://download.asic.gov.au/media/1236706/rg5-published-20-december-2013.pdf
Thus, the buyer of that 1.87% must already have less than 3.13% control of the company shares if one of those forms was not required to be filled out well before the April T20 deadline.
btw.. has anyone actually asked the company to do a current T20 list ? It is not uncommon for many ASX company's to do so if requested.