Year Old Bagged Mulch

Hi,

 I have about 8 bags of Scott's Mulch (red colored) that I bought last
summer. They were extra bags tha I didn't use at that time. They have
been sitting outside in the backyard since then. Is it okay to use
them now (after about 10 months)? Could there be any problems with
mold or fungus? Would that be something clearly visible?

Thanks.  

G.M.