I think we should understand that sometimes, lack of attribution can honestly happen by accident. It’s not an excuse to not credit the original creators whenever you can, but it’s genuinely possible that someone may not know where the original idea came from.
For example: I personally have talked to my team about the 148 rocker slide pod, referring to it as exactly that (attributing it to 148 when I bring it up), because that’s what I refer to it as in my own head. But it’s quite possible that a few years from now, if I end up leaving this team, there will be someone who remembers the rocker pod design, but refers to it in passing conversation as just “that rocker pod slide drive” or something. Team members who only hear about the design from that person will never even realize that it was initially a 148 design, and therefore won’t attribute it to them.
I think, especially in the FIRST community, most do not want to take credit for something they did not create. Rather, I would tend to give people the benefit of the doubt and assume that they genuinely did not know that the design was something special that needed to be attributed, or at least did not know who to attribute it to. In this case, a simple “Hey, not sure if you knew this, but we initially came up with this design and are quite proud of it, and we’d appreciate it if you gave us credit for that” would do.