Jason,
Unless magnified, those are probably not spider mites. The paper test requires 1 more step. The smear. Put the paper on a flat surface after shaking the branch over it and rub your hand on it from top to bottom in 1 smooth stroke. You should see little or nothing on the paper until you smear and then little smear lines after you smear. The smears were spider mites.
Regards,
Martin