can't find the 3d model for the dragon quest walk

[Boxy]

For this game most models aren't in the apk, they're downloaded to the cache folder as you play. So you either need to see it in-game to have the files, or try finding another way to download resources from the source. They also started stripping the Unity version from the files a while ago (at least, last time I checked), which means some programs might not load all the models if the version isn't specified.