Question About Chests

I am an MC game developer and love the look of the custom WynnCraft chests and was just wondering if anyone knew how they were designed. I know that they are entities but didn't know if they were block displays or a model for an unknown mob using plugins. (I do not mind at all if you have to reject this if the staff do not want this info out I do not blame you guys :D ) Im just really curious

 

which chests

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there's like 20 of them.
Unidentified items? Loot chests? Raid chests? Lootrun chests? Scavenger chest? Crates? Caches? Cave completion chests?

 

Oh sorry, I meant like the chests that appear when you kill all of the piglins in that cave off the start. I mean like how are they made or designed model-wise. I was just wondering because I'm curious how the model was made. I'm still very new to the server so I didn't know there were that many. I wanted to model some custom chests myself but I was using display entities until I saw the chests in Wynncraft. They look so cool so I wanted to know how they were made. (The Lootrunning ones also look stunning) Thanks!

 

They also use displays

 

This is one of the chests I was talking about

 

thats cave completion btw

 

Yeah I know I was just giving a example of one of the chests that I liked :D