There's ways, and it depends. I'm learning this stuff so take it in consideration. It depends, of course, who, why and how sent you the notice and how comfortable you are with possible responses. There's no cheat sheet (well, there is but for learning, not copying).

One of the most powerful tools we can use is a conditional acceptance. It's a way of staying in honor while throwing the hot potato to the other party. You accept the offer at conditions. This tool is simple and incredibly powerfull.

There's ways using the post office, postmarks, thumbprints, pen colors, way of writing over the notice, way of signing/autographing... All become more clear by studying and practicing. The more knowledgeable we become the more possibilities to respond we have, hence, become more response-able