You make a good point about your "discover" issue regarding withdrawal of claims or appeals. I went through a similar issue with the VA in March 2014. I had two separate appeals for different conditions, filed at different times. Mine had been shown in ebenefits as Appeal Pending for several months. I called the BVA to check the status and was told one of my appeals shows withdrawn & the other was still with the RO.I explained I had withdrawn nothing. I was advised to contact my RO. Upon further examination of that appeal, it showed I had 2 different BVA dispatches sent to me. One in October 2013 and another in February 2014. I had received neither. I called my VSR and asked since you have been my rep for 7yrs, did you receive either of these BVA dispatches? He confirmed they had not. I explained the situation to him and in April he sent the VARO notice of the occurrence. In August 2014 my appeal showed up again as pending but a new date of August 2014.
After seeing your post, I cannot help but wonder is this a new tactic by VARO's to show they are clearing some of the backlog? By whatever means you found this withdrawal notice of your claim, all I can say is Good Job.