So, I want to hide the fact I am on a Virtualbox VM in Device Manager... Is there anyway I can do that?
Well its not only in device manager that it says Virtual Box, it's also in System info and dxdiag which some scammers usually check, but lots just ignore it. I don't know 100% but I think there is a file you can edit that will change it from saying Virtual Box in System info.
Try this: https://www.eightforums.com/customization/15321-tutorial-how-change-device-names-device-manager.html
I haven't tried this because I run VMware.