There is no requirement to get it signed and doing so creates work.
You should simply establish procedures for disclosures you are required to give out. You routinely give them out, so you know you have met your disclosure requirements. As was noted above, you keep at least one for retention so you know what was said, and when it was the disclosure that was provided. I did this in my forms book where I sliced and diced all compliance disclosures denoting compliance with the various requirements. Since our Marketing dept handled the printing, they always kept a few copies as well.
My opinions are not necessarily my employers.
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell