For a while Samsung made a lot of everything Apple made. I think that’s maybe more coincidence than ODM.

That said, if it were the case it wouldn’t be the first time. The LG 5K display was very much an Apple/LG project the former wasn’t happy to put their name on (in its defense, I have a revision 2 model and think it’s great). Logitech made Apple keyboards and Mice for a long time (no idea if that’s still the case) and would happily let you know in System Profiler or a manufacturing sticker somewhere in the product. In the 90s, many printing products were straight up HP and Cannon printers with a rainbow Apple logo. I’m guessing we wouldn’t really hear as much about the ODM rebrands of minor devices that work out that don’t make it obvious what they are.