Speaking as an archaeometrist, I have to agree the cube in question does have the distinct appearance of something made by a Seeker. The use of triangles, groupings of three and ratios of 33.3 and 66.6 percent all relate to the inherent Seeker propensity to trine, that is make units of three. As well, their choice in alt-mode very often relates to this, as tetrajets or delta-wing jets are three-sided.