Saints Row Achievement Help

So I was just browsing through the Gamespot game guide for Saints Row and checking out the achievements. One of them is labelled ''Professional Thief'' and requires that you steal 30 boxes and deliver them successfully. What boxes? Is stealing boxes part of an activity? I haven't run across any boxes to steal; at least not that I've noticed. Help?Saints Row Achievement Help
Stealing boxes is an activity you do during the after hours.  Wait until it becomes night time and break into a store and run towards the safe.  Once you crack the safe, there will be a box inside and take it to the drop off point.  If you have a car, you can car more boxes by putting them in the trunk.  Certain cars carry more boxes then others, so choose wisely.  It's not hard at all but just time consuming.  Remember though, it must be dark outside to do this activity.  If you try to crack the safe during the daytime, all you receive is money from the safe.Saints Row Achievement Help
Its when you hold up a store. the clerk will lead you to the back and to the safe. There will be a box or cash in there. I havent played the game in about 8 months, so I might not be 100% correct.
Awesome. Thanks for the help guys!
The easiest place to do this is in the suburbs district. There is an area with like 4 or 5 stores in close proximity to where you have to bring the boxes and there is even a forgive and forget close by. I was able to get like 5 boxes on each run with no trouble because of the forgive and forget.

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