Probably sound silly here but I'm not 100% sure about the tape being there anymore, I think! it's only residue left from where tape was once there, it's not easy to say.
I have thought (very briefly) about trying to remove it myself but I don't think I'd ever be that brave as I'm bound to mess it up altogether if I were to try anything like this.
Trouble is to get it removed by a pro restorer would almost certainly cost as much as the actual poster cost me in the first place.
I should just add, I'm more interested than anything in just knowing if others would leave it or remove it, that's the only question I really want to know.