Am i getting scammed?

Hey guys i just bought lsd from a guy in my college for 3k for 350 μg(supposedly). On the blot however the dose is mentioned as 150 μg. I asked that guy and he assured me it was 350 μg, i came back researched some and found out it was highly unlikely. Now the problem is i am planning to microdose it for a unrelated problem so i NEED to know the actual dose of the stuff im diluting.

Is there any way to check for the purity or the dosage of what i have got? I have also attached images and do guys think the blot is fishy, visually?

If yes should i just go return it to that guy?