I have 50,000+ sports cards I would like to sell

Here is the album of cards: http://imgur.com/a/9Y5hk.

These cards are anywhere from 1985 - 1994, with most being 1990-1992.

I'm finding that I should be able to sell the sealed boxes for roughly $15 each, with a few exceptions. A lot of the boxes, however, have been opened or sorted into other storage boxes. I don't know much about card collecting, but I imagine there is nothing crazy valuable I need to search for before attempting to sell these.

Any advice at all would be greatly appreciated before I go about selling these.