Aside from appearance I don’t know if you can. Is there a road film anywhere on it?
I mark my wheels when I take my truck in for an oil, filter and tire rotation to avoid a previous issue with a dealer lying about the work done.One way to tell is to simply make a mark on the filter just before you take it in. A small dent with a ball peen hammer, and etch of your initial with a nail, etc. If you're really concerned about the dealer, or just to test a never before used dealer, it's worth the small trouble. My brother says I'm paranoid. I'm not. I just like him thinking that. (I'm 67 and he's still three years younger, so it works.)
Come to think of it, it was pretty clean. At the time I didn't think that much of it because I thought the whole bike was "clean" under there (being new). But I have checked again and yes, the thing has filmed up now after only a few more days - suggesting that the filter was indeed a new one. Good suggestionAside from appearance I don’t know if you can. Is there a road film anywhere on it?