Although i'm quite sure my spouse and i added signatures to our return, i see no signatures on my copy of our return. return has been accepted.

When you e-file, there is no physical signature on the tax form.  You "signed" electronically when you entered your AGI or PIN.   If you file it by mail, you have to use a pen and sign it in ink on next to the words Sign Here.  If you are ever asked by a lender, etc. for a "signed" copy of your tax return---take out a pen and sign and date it to keep them happy.

When you e-File, your return is presumed to be signed.

@houndoger