Just about to post the same thing. And don't take it personal. Unless you're going to a legal state, it's probably not what it's supposed to be. But again, doesn't mean you won't get high. Just means it's most likely cut, hopefully with flavored terps you can literally buy on Amazon (just try searching for banana kush terps or even Dank and Brass Knuckles [2 popular cartridges that are frequently knocked off] cartridges.)
The liquid is the biggest indicator. That bubble shouldn't move unless you've been vaping the shit out of it, because then the concentrate is heated and less viscous.
The other problem I would have is the packaging. There's nothing on the packaging that's tamper proof. In fact, one looks kinda beat up already but that could just be from opening and transport.
Ultimately, how much do you trust your guy? That's pretty much the ultimate question with any dealer though, I guess. This is why I stopped fucking with those. Too much bunk shit out there and I wound up getting sick with some type of respiratory infection twice. Don't know if it came from carts or not but I just got tired of all the risk.
TLDR-- stick to flower or better yet, get yourself a couple of those concentrates pictured above, buy a small amount of nicotine- free vape juice and empty cartridges, then make your own. Not that difficult plus you can have more control over what you're vaping.