To my knowledge he drops all the items which he had on the ground when he is abducted (as do all the romances who are abducted). Assuming you don't want to go back to an earlier save (if indeed you have an earlier save), then here are some codes to re-create the items (hey, in reality if that happened the items wouldn't have been dropped on the ground, right?)
Robe of Vecna - WA2ROBE
Blade of Searing (Is this the BoS?) - SW1H39
Equalizer - SW1H54
Daystar - SW1H31
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