If they seem dry I would harvest them and try winter sowing them! What's to lose? Are they in a little samara like the regular big maples? Can you get the seeds out of the outside coating? I would try sowing them both inside and taken out of the little wings assuming they come in those little wings. I would do it now and not wait until winter because sometimes trees need both a warm and a cold period. I have not done it myself but if you have a lot of seeds you have nothing to lose!
Joann

I have read that you should soak the seeds in water for a day or two and then put them in the fridge (in a ziplock with potting soil) for about 100 days before you want to plant them. I have also read that winter sowing can work but is not as reliable as this method. I have not done it but I have been wanting to try. Any chance you could send me seeds if I sent a SASE?