@st8653 It depends on how you actually filed the return. Your question only references that you are mailing checks. So, if you electronically filed your return, but are mailing the checks for payment - then no need to include your returns and W2s. There should be a payment voucher you can use (Form 1040V) and you can send your check with this voucher.
If you are mailing your return and checks, then you need to include your return, W2s and check. TurboTax would have printed you a filing instruction page.
