"Mark as Reviewed" UI pattern advice

Designing for an enterprise application wherein the user's primary area of focus is on a tabled list of "notices."

The user's task is to look through their notices and evaluate each each one, determining which ones demand further action and which ones do not.

Above the table is an Action Bar with a wide array of actions the user can take on table content; they can check off notices in the table and then use buttons in the action bar to export, trash, comment, print list, and "mark as reviewed".

That last one is the sticking point -- I'm trying to come up with an icon that signifies "mark as reviewed." This action would mark any selected table rows with some kind of flag indicating that they've been seen.

Any ideas? Previously I was using an "open envelope with checkmark" icon, but in testing users resoundingly associated this with some sort of sharing-related functionality i.e. emailing notices to other users. Thanks for your input.

EDIT: To be clear, I welcome not just icon suggestions but any advice including a rethink/rework of this pattern. Let me provide an image as well:

In the above still image, the user is hovering the "Mark as Reviewed" icon, causing a tooltip label to appear below it.