I wish I was one of those with mystery CTBG shares in my account. They may actually be worth something. The other day I put 10K shares up for sale on my E*trade acct. I just wanted to see if any warning signs came up. There were none. I didn't execute the order.
I called E*Trade to see if they had any CTBG warnings. Nope. There is no guarantee the replacement shares won't have a problem down the road.