CHICAGO (CBS) -- The shelf was left bare at a CVS Pharmacy in Downers Grove, police say, when a woman stole the store's entire stock of Rogaine hair loss treatment earlier this week.

It was the noise of boxes falling that first tipped off a store clerk, police say.

And then a woman ran out and the anti-theft alarm went off. Workers found that 10 boxes of Rogaine worth $400 were missing from the shelf.

Police say store video shows the woman was in and out of the store in two minutes.

They say she ran out to a Chevy Tahoe--where three men were waiting--and then they all sped off.

LISTEN: WBBM Newsradio's Steve Miller Reports