Hey, be happy it is processing - means they acknowledged acceptance at least.
I have a package that will expire a week from today that still hasn't been marked received and I mailed it within a day or two of submitting it.
And then there's the one game out of 5 that never moved from "pending audit" even when the other 4 were paid. I contacted eBay about it and got two responses that basically said they were looking into it and to stay tuned. I just checked that transaction out and even though it has been over a month, that one game now shows "Processing". So maybe that's a good sign on that one, at least! Though I suppose it could still move to "expired" even after processing, so I won't get too excited until I get paid for it. But at the very least, it does seem like they have the power to keep a transaction open past 3 weeks.