I put the old passport and just the one EAD from TPS from last year.
Regardless of this I don't think Passport matters to them. Passport just proves nationality expired or not. I sent them the old expired passport. I think the TPS EAD and TPS approval document should suffice. ...don' think there is setting stone on what documents are needed.

Also i think a lot of people send their docs early so if any of you are waiting around hurry up..
Last year i think I was the first person to received TPS ..I send the doc the day it was opened...and was approved in a month.