MVM bomb troubles

I'm having some issues trying to make the bomb for an mvm map, the guides I've read haven't given as much information on the bomb as I'd like, namely the model path for the item_teamflag not letting me browse models for some reason, and when I try and copy-paste the file path from a prop I was able to give the model, it doesn't change model and the compiler log gives me an error about it.

models\props_td\atom_bomb is the file path I found

I can't seem to find where the bomb is placed, is there a way to search for it somehow?