They seem too large and cumbersome for these 1/4" "box" joints. Thanks for the clarification on finger vs box joints.
Never make assumptions about which type joint it is. If you do a web search on finger joints about 75% of them come back as "a finger joint also known as a box joint". All of Fine Woodworking's contributors refer to a box joint as a finger joint first. Most of older woodworking literature also refer to it as a finger joint. The tapered fingers were specifically referred to as a tapered finger joint or as a splice joint since that is the only function of that type joint i.e. end joining two boards together. That is the main clue about which type joint is being discussed is whether it is the splicing type or not.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.