I did catch her deleting things. Her reason was she didn't want me to worry. She knew even the mere mention of his name caused distress. Things were innocent, yet I couldn't STAND that they still communicated. PERIOD. Even if it was once a month.
It could be that she's protecting you. She may know how this bothers you.
In my case, my W finally quit her job once the OM got promoted. She never gave notice - just resigned on the spot. I'm a firm believer that once an affair is busted at work, employment should end immediately. One of the biggest regrets I have is letting her stay on a year after she was caught. I have nothing but disdain for the MC that advised this.
You may want to discuss this with your W. That this work situation is no longer tolerable.
Me: 52 Her: 48 2D 26 & 16 M: 25 years (together 30) EA/discovered by accident Valentines day 2016 Admitted SOME physical but no IC. We know that's a lie. Status - tryin to R