Thanks for your question about disposing of unwanted bird seed.  You have a couple of options.  If you have lots of time on your hands, you can separate out the 'fillers,' typically the millet that gets 'tossed,' and keep the seeds you want to replenish your feeders.  You can also take it to an area where you know there to be sparrows, doves and cardinals, which all consume the millet according to this article (which has some good ideas about DIY seed mixes.  If neither of these interest you, you can just put it in the compost bin.  It will eventually decompose (although germinating the seeds before you do so will speed up the decomposition rate.)

Hope this is helpful.  Good luck!

Thank you for your prompt response.

You're welcome!