Best way to do implement this wine idea?

Could you make the box be the guest book? If it is not big enough for all of the attendees to sign, have your wedding party/family sign with well wishes that you will read when you open the box in 5 years!

What about doing the clasp but with a little lock and key?

Instead of sand or candle ceremony we are doing a wine blending ceremony which i thought was a fun alternative

Awe that will be adorable!!! or have him put the lock on and you and your FH close it together ugh that sounds so awesome.

We wanted to incorporate our kids too but i didn't want the same old sand ceremony everyone is doing. so we opted out - i'm not sure if i'll regret that.

This is a cute idea!! Wine boxes are definitely a thing, I've seen them all over the place (just as decoration they're cute). You would incorporate it into the ceremony as you would any other unity aspect. Your officiant can explain to your guests what you're doing and what it symbolizes and as they explain it, or afterwards, you and your FH can walk over the wine box, set the wine in the box, and hammer it shut. Maybe you can each hit the nail a few times on your own, then do it together for symbolic reasons. Here's a great article I found!

https://www.brides.com/story/wine-box-ceremony

We are not doing wine, but are doing the time capsule portion. We are putting letters to each other in the box, as well as favorite photos and letters from our immediate family. My FH does construction, so he is making the box. We will open on our 5 yr (wood) anniversary.. or if there is ever a time in which we need to re-kindle from a fight.. we are nailing ours with a custom hammer we had made. We plan to build a house in the next few years, so that hammer will also put the first and last nail in our new home.