Chocolate boxes/baskets act like charms right?

Yeah, this never used to happen.

I'm also wondering why I can't do the Basket quest and Cody's Valentine quest again? Just the Heart Choco one this year. My mule was able to do all three. Why can't my main do 'em all again?

I know this wouldn't affect quest count (because I've done them before), but I'm just curious as to why.

It's because the basket quest and cody's valentine quest are not repeatable at all and Nexon just reused last year's quests.