I would be upfront with the attorney and just let him know that under the rules and regulations I cannot notarize anything that I have personally not seen signed. I might remind him that I could face serious charges if I did and I’m just not willing to risk that.
I’m sure he would be irritated at the least and furious at the worse, but it is what it is. After it’s happened one or two time though I’m sure he would know better than to ask me to do it without following all the rules.