Are we talking regs to mids? If so then a few gram bonus may tend to happen if the guys cool. If we're talking stems and maybe seeds, then he may have been compensating for them (if he's a decent guy). He might have just wanted your future business. If we're talking dank weed, then he may have fucked up. Nothing you can do about it now.
I used to know guys that would weigh out bags super fat and after you go through him a few times and start to rely on 'em, they start weighing bags real slack and throwing in the shit weed. In any cayse, enjoy it :thumbsup: