Need to know what to look for in young Silkie chicks.

[Musicchic98]

I am picking up some Silkie chicks this Friday and I was wondering if anyone out there hatches out pure silkies and can tell me what to definatley look for to make sure I am getting silkies and not a Silkie mutt. The lady has black silkies and white silkies. I know they are supposed to have feathered feet and five toes, however I have heard every once in a while they won't have the fifth toe. I dont know this lady from Adam and just don't want to pay for something I'm not really looking for! Thank you