I don't think DFX2 had a box sleeve. When I purchased my copy of DFX2 in 2015 it was $14.50 and the ebay listing was "Delta Force Xtreme 2 II video game PC Brand New Factor Sealed!". Came in one of those Xbox like plastic black cases with shrink wrap.
There is someone selling a new copy on Amazon right now here: https://www.amazon.com/gp/offer-listing/B002GYVVZ6/
"Brand new , factory sealed in retail box, U.S retail version." Not sure if it's an actual box or not.