Unless There is Is Discrepancy

I think that WashU is need-aware.   Did you apply for aid?  If you did apply for aid and you have filed the neccesary CSS Profile and FAFSA and supplied all required documents by the deadline, there is no reason for the school to request additional informaiton from you unless there is discrepancy.   If you did not appy for aid, there is no incentive for the school to request additional document from you.