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I found the document below on the IAEA website:

http://www.iaea.org/OurWork/SV/Invo/reports/s_2003_95.pdf

Page12, paragraph 1 (emphasis added)

HMX

53. The relocation and consumption of HMX (a high explosive of potential use in nuclear weapons), as described in Iraq’s backlog of semi-annual declarations, has been investigated by IAEA. In those declarations, Iraq stated that, between 1998 and 2002, it had transferred 32 of the 228 tons of HMX which had been under IAEA seal as of December 1998 to other locations. In addition, Iraq stated that a very small quantity (46 kilograms) of HMX had been used at munitions factories for research and development. At the request of IAEA, Iraq has provided further clarification on the movement and use of the HMX, indicating that the 32 tons of HMX had been blended with sulphur to produce industrial explosives, which had been provided mainly to cement plants for quarrying, and that the research and development using the small quantity of HMX had been in the areas of personnel mines, explosives in civilian use, missile warhead filling and research on tanks.

54. The IAEA inspectors have been able to verify and re-seal the remaining balance of approximately 196 tons of HMX, most of which has remained at the original storage location. The movement of the blended HMX and the other small quantity of HMX has also been documented by Iraq. However, it has not been possible to verify the use of those materials, as all of it is said to have been consumed through explosions and there are no immediately available technical means for verifying such uses. The IAEA will continue to investigate means of verifying the Iraqi statements about the use of the HMX and blended HMX.

Same document, Page14, Paragraph 1

The disposition of the 32 tons of the previously monitored HMX that Iraq declared to have been used for civilian purposes, however, will be difficult to confirm.

Seems that, as of 2003, the quantity at the site was 196 tons, not the 388 reported.