I agree! Guinea eggs are my favorite, followed by duck, then chicken...I hope your guinea hen will use the nest boxes - mine initially used their nest boxes, then decided to just hide them wherever it struck their fancy. Including in places where they got exposed to the elements....and they seemed to really enjoy burying them. Commence the treasure hunt!
Enjoy that wonderful egg! Like @red horse ranch said, guinea eggs are delicious (arguably tastier than chicken or duck), with a tough shell.