Chinning - their chin contains scent glands, so they rub their chin on items to indicate that they belong to them.
Bunny hop/dance - a sign of pure joy & happiness!

My bun doesn't do any of the stuff above.. Does that mean Buggsy isn't happy?

all buns are different it doesn't nessassarily mean they aren't happy, but it can change when they get more and more comfortable. Or they may never do it you will know when they are happy they sometimes show it in different ways.

The older a rabbit gets, the more layback he gets. Bunnie do way more dancing, and at least with my rabbits, they do very little dancing after the age of about 2 or 3 years of age. Same thing with chinning.

my bun is just under a year old

Smudge used to be binkying off the walls during his floortime before he was fixed, but since he was fixed and has free range he hardly binkies or chins anymore (except when he gets food LOL). I still know that he is very content and happy though... The more you get to know your rabbit and its body language, the easier it is to see more subtle signs of happieness or discontent.
All rabbits dont express happieness in the same way too. Like, Ive never seen our other rabbit binky at all in his 7 years, but he still obvious,y enjoys running around out of his cage. He seems to be happiest when he gets his veggies... he even "sings" hes so happy!
Smudge is very laid back, and he loves just sleeping in weird places and relaxing in dead bunny flops. Its not binkying, but you can still tell that he is VERY happy and content!

Each bunny is different, as was said. My rexy Akina has never binkied but you can tell she's happy because she lays down by you and rubs her teeth together in pleasure as you rub her head. And Acacia does most of the chinning because she can smell Akina on things from before and she wants them as hers. Then Akina comes along and re-chins it to re-claim it... *Rolls eyes*