how to sort 10,000 + collection

I have just been selected to liquadte a die car collection and need some advise on how to sort into ctagories.  This collection is still in original packages, never opened, never inventoried, never "cherry picked".  Est apx 90 % hot wheels/matchbox.  Any suggestions?

I am looking for one BMW 327 cabriole Guiloy 1/18 at reasonable price!