It's never a good idea to eat foods past their expiration date. However, unless the nuts are completely moldy, eating expired macadamia nuts isn't going to pose a massive health risk.
How long do macadamia nuts last after expiration date?
PantryFridgeMacadamia nuts5 – 6 months12 months
Can you get sick from macadamia nuts?
When taken by mouth: Macadamia nuts are LIKELY SAFE for most people in food amounts. But some people are allergic to hazelnuts and have had serious allergic reactions, including life-threatening breathing problems (anaphylaxis).
More useful articles on a similar topic 👇
How do I use old macadamia nuts?Should you refrigerate macadamia nuts?