Hi,
good question. If you want the "exact" passive version of "stole", then it's "was stolen". But if you consider that example you gave, then... it's something I've always wanted to know. I think I also asked here, but I got no answer. Let's try again.
American active exclamation #1: Damn! Somebody stole my bike! Where is it? It was here a second ago...
American active exclamation #2: Damn! Somebody's stolen my bike! Where is it? It was here a second ago...
American passive exclamation #1: Damn! My bike was stolen! Where is it? It was here a second ago...
American passive exclamation #2: Damn! My bike's been stolen! Where is it? It was here a second ago...
I think that the active version would be #1 90% of the times. But I don't know why I feel the passive version would actually be #2. So the preference for the verb tense changes, at least in American English.
So even though the passive form of "stole" should be "was stolen", I feel that's not completely true, and it depends on the context.
Now we need some native speakers to know more about this.