Chol Hamoed

I discovered buried treasure on Chol Hamoed, and I’m afraid that if I wait until after Yom Tov someone else might find it. May I dig it up on Chol Hamoed?

I heard that Besamim is NOT used for Havdala on Motzei Shabat Chol Hamoed, is this true?

I do not understand the Rabbinic prohibition of not shaving during Chol HaMoed.

Is doing the laundry completely forbidden on Chol Hamoed?

Does one were Tefillin on Chol Hamoed?