Scott,
A product that some have had success with is "Un-Do Adhesive Remover" - an acid free "safe for photos" liquid that safely removes all traces of adhesives - see their website.
If it were me and the hologram sticker was not obtrusive (say in the bottom right corner), I would leave it alone. If you just have to get rid of it, just be careful that their is no crazing of the emulsion in that area to avoid pathways down to the paper fibers.
Cheers,
Craig
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