The international version of OFP comes in a DVD case. Well, actually, some of the DVD cases come in an external box. And, actually again, some of these copies of OFP are bundled with another one of Codemaster's games, 1nsane, a racing sim. And, actually another time, the US version of OFP comes in a CD case - not a DVD case.
Inside the OFP box or case you'll find one CD, an OFP Field Manual, an OFP summary reference card and a Codemasters product pamphlet.
If you purchased the international version of OFP, there might also be a technical notice to Windows 2000 users, regarding potential difficulties in loading OFP beyond the opening logo screens. You may ignore this if you apply the latest upgrades after first installing OFP.