I'm nursing mine. I too had a box of 10, plus a few more I had around, I had from previous scares- sars, swine flu, bird flu etc... I've been nursing mine and leaving it on the dashboard of my car to sanitize with sunlight inside a zip lock. Works for me.
I had to spread them out between my son, wife, girlfriend, her son and myself. Still have the full and half face masks with n100 filters I used in construction years ago when doing asbestos abatement during electrical work. Hope never to have to use those again.