Barely visible tiny dark. Took everything out of cupboards and disinfected the cupboards. Did not find source. Is there anything you can put in cupboards to keep them out?

Cupboards are such an odd place to find mites. Are you sure they're not a beetle?

Do they look anything like these:
Image Search Results (http://www.goodsearch.com/searchimage.aspx?keywords=drugstore+beetles)