for 10 bucks, just let it go.... this probably won't be the 1st time you get screwed over.... and the hassle you make for yourself trying to do something about it isnt worth it... I've been scammed out of 100's of dollars many different times because you give a good friend X amount of dollars to go get a bag and he comes back with a couple dimes of dirt and pockets the rest...

my advice, unless its a proven source and a proven friend, make sure you see what your buying before you hand over money...otherwise, just wait for the right deal and you wont get fucked