Well that depends on who you got it from. It will continue to cure if the RH is above 55% and you have hygrometer to check it. Put it in a sealed glass jar not much bigger then the amount you have and let it sit. Won't hurt most likely will cure more.
It depends if the weed has been properly cured in the first place I guess.
I see no reason why you cant continue to cure it, unless the stuff is bone dry. As stated above get a glass jar and put your bud in there, take out what you want to smoke and continue let it sit in the jar, open the jar like once a day, can't hurt anything and might actually make it a touch better.
In order for this to do any good you will probably have to rehydrate the buds and start from the beginning. Even at that I don't think it will make much of a difference.