This material is taken verbatim from the original Sigma DP2 (non-Merrill non-Quattro) catalog:
HOOD ADAPTER : HA-21 This set consists of a lens hood to block out extraneous light, plus a hood adapter, designed to fit a 46mm filter or a macro lens.
VIEW FINDER : VF-21 This compact optical viewfinder mounts on the camera's hot shoe. It comes with frame equivalent to 41mm on a 35mm SLR.
ELECTRONIC FLASH : EF-140 DG This compact external flashgun was created exclusively for the DP series. With a guide number 2.4 times the camera’s built-in flash, it extends your shooting range.
CLOSE-UP LENS : AML-1 Mount this lens on the optional Hood Adapter HA-21 for easy close-up photography. The exclusive design delivers outstanding image quality from the center of the screen right to the edges.
HARD CASE : HC-11 This dedicated hard case is specifically designed to protect the DP2 from damage. Made from high-quality black leather which gains in distinction as it wears, the case can be removed even with the camera strap is attached.
The specifications also indicate the following items:
Li-ion Battery BP-31, Battery Charger BC-31, Lens Cap LCP-11, Neck Strap NS-11, Soft Case CS-70, Hot Shoe Cover HSC-11, USB Cable, Video Cable, SIGMA Photo Pro Disc, Instruction Manual
The Sigma DP2 user's manual also notes the availability of the AC adapter:
AC ADAPTER SAC-3 This is used to provide a constant electricity supply and is recommended when taking indoor shots or connecting the camera to your computer to transfer data.