The ads basically fall off the search at 90 days or more. We can refresh the ad to bring it back in. I'll look at it shortly.
As per the classifieds FAQ page
How long will my ad remain on the website?
In general, an ad is automatically deactivated from the website after 3 months. You will receive an email a week before D-Day and another on the day of deactivation. You have the ability to put them online in the following month by logging into your account on the site. After this delay, your ad will be automatically removed from the website.