I don't understand the Gigas Sword or the Tonberry Knife.
In fact, I know they just added the Gigas Shield to the Gold Saucer in 4.5.
Glamour item for a DoH? Odd. Why's it not the Mainhand tool? Tonberry Knife... okay, but many of the knives already look like that. I sort of get the theme in that Cooking is tied to Valentine's Day (in reference to making the chocolates for your interest). So doing something for the Culinarian is acceptable, but the Tonberry Knife isn't what I'd take. How about a Frying Pan that has a heart on the base of it? I know that can't be hard to make. It would literally just be a texture swap, which would take a professional (4 years AAA game experience being a prereq to join these companies) maybe a couple quarters of time to throw together. Frying pan with a heart on it would go over better.

Gigas Sword? Why are you not in the Gold Saucer with your Gigas Shield friend? You don't even look good... Not to mention, how do you fit in to the theme? Butcher your lovers with lame sword? Again, Tonberry Knife is closer to base with this one (even if we're still talking about a knife Tonberries just use to shank people mercilessly, and doesn't even look great).

I'm also concerned about whether I can put these in the Armour Dresser thing, cause I will never use them, but their limited release retain inherent value.

I would take a frying pan with a heart on it over the Tonberry Knife. Sure, it would technically be infinitely more development than the Tonberry Knife, cause the Tonberry Knife asset already exists, whereas the texture of a heart on a frying pan would have to be made, but as I said before, that would be maybe 50 cents of time to actually throw together. I'm sure a developer in charge of the event spent at least 15 minutes in a day getting paid to smoke.

Gigas Sword... What? How about WAR gets Julia Manderville's oversized Frying Pan glamour instead? Add heart to that too.

I'll just give SE $100 if they can give me a reason to appreciate whatever lore would make the Gigas Sword and Tonberry Knife actually seem appealing for a Valentine's Day event.