I've been doing an explosives role play character and was wanting to have him "crafting" firebombs by using console commands to add them to his inventory while dropping the materials (ie bottles, flamer fuel and clothes) into containers along the way. However the game isn't recognizing the base id I got from the Fallout Wiki. I've confirmed the correct two digit prefix on the Honest Hearts expansion for my load order and even tried it with the other prefix's to be certain. Could anyone suggest what my mistake might be?

Are you putting in the leading 0's after the offset but before the code?

02000345

not

02345

And, how did you get the offset? I always fire up FOMM to see what the load order is before using these commands in the game.