My bounce defaults to the same project and creates a new track in that project. I would have to specify a different location and forget the new location to lose it.... but the search function in windows would find it if it's on the computer.
I do agree it is always a good idea to double check where the bounce or EXPORT is heading to.
Bounce should always end up in the existing project by default..... an EXPORT is totally different and it is possible to misplace an export if you're not paying attention.... but it's easy to find it once you realise you can't find it where you think it should have been.
I have exported a few times and didn't specify the folder.... but that is a quick find. Simply redo the bounce without changing any setting and observe the "default location" it is using.
It will probably be in a temporary files folder under the logged in user's name.
I always try to place a new folder with all the files connected to a project in my working folder for music. That makes it easy to find the song, the project and any other files connected to it like lyric sheets and note files.