From the CISA website:
http://www.cisa.gov/rumorcontrol#rumor19
This looks like it sinks the theory that the CISA provided watermarked mail in ballots to the states.
"While DHS and CISA assist states and localities with securing election infrastructure, DHS and CISA do not design, print, or audit ballots. State and local election officials manage ballot design and printing, as well as the auditing of results."