lets say there is a hard brick of weed, what are some things that could be done to refresh it? (make it fluffy and presentable)
Back about the time that your parents were probably born, that's about all there was around - now they call it Brickweed or Mexican Dirtweed. Just pull it apart with your hands (and maybe a screwdriver). " - - - fluffy and presentable?" Are you shitting me? Why do you think they call it Dirtweed???
/\ Brick weed is not always dirt. Best thing that I could advise is breaking it up more into smaller chunks so it doesnt look compacted. And stick some orange peels in the bag and let it sit.
It might not be dirtweed. There has been some decent commercial weed packaged like that so it can be moved. For a long time (in the 80's) brick was all you had and with everything it varied from crap to damn good (Monkey Paw came that way and it was mind numbing).