The current master of the house that Kogure claims to be working for possibly did it, that or another faction is in the background.

Who I'm almost willing to bet is Silver/Gold.

Oh you're probably right. Maybe Arsene Lupin modified lupinranger's vehicle and his descendant modified patranger's vehicle.

Kogure is going to have more to do in the future! He has secrets, and for all we know, might be conspiring with the Gangler who was responsible for the sadness that the Lupins are trying to rectify. I doubt that Arsene is completely responsible for everything, cause some of these vehicles are too modern, and Arsene was arguably stealing before Earth had the vehicles the Lupin Collection is based on (speculation), though another take is that since the Collection originates from an alternate dimension, then the Collection shouldn't resemble Earth vehicles without some alterations. Destra is also an oddity for his conniving nature. He noted that the Collection the teams are using are probably altered/made for humans, so some of the VS gear are not normal Collection artifacts. If the Collection originates from the same dimension as the Ganglers, then they may take the VS vehicles back. On top of that, Kogure doesn't care if both sides use the vehicles, indicating that the "VS" for the vehicles might also have an in-show meaning and that the teams are meant to fight each other for some unknown purpose. This has some merit given that Kogure supplied pieces to the Lupins, but the GSPO is also knowingly using pieces. There is definitely some unseen action!

Kogure and Destra are the primary focus until the new Ranger appears!