Maybe keep it for emergencies, I'd do that with the Harry Hamster at least. Last time I had the PAH stuff, I chucked it out because my hamster just didn't like it and I'd only bought it because that was what she was being fed at the time I got her.
we got a bag of P@H stuff with a second hand cage we bought, we just popped it on our window sill (outside bit before you all think i'm nuts ) a bit at a time for the birds