@wyvicky1031 , since these may not result in any additional taxes for you you can choose to (a) do nothing and wait ( perhaps for a year ) , in case the IRS wants anything OR (b) file an amended return recognizing the the 1042-S es and not have to worry . If you do file an amended return, you should wait at least till your original filed return has been processed ( as signified by your refund being issued OR at least six weeks has passed ) --- you send by mail the 1040-X and the amended 1040-NR ( which is summarized on 1040-X ).
BTW -- you do not need to attach the 1042-S es -- since the IRS would already have these on file.
Hope this answers your query
