It’s very possible even likely that if the officer came upon Brown a few minutes after the robbery that both the officer and Brown heard the BOLO {Be On Look Out} go out over his radio. Second possibility Brown though the officer knew. It is also standard procedure in most departments to run a wanted check that too could have triggered it. The stop likely was for just what was initially said which was jaywalking/obstruction of traffic. Some felons get very dangerous when cornered and think they are caught.
If that’s true then the BOLO would be a matter of record but since it was a petty theft of a few cigars odds are that there was no BOLO.
And if there was a BOLO it would have been released by the Chief today and it wasn’t.