Holy crap. Something very similar happened at a nearby Target a few years ago. They backed a panel van up to one of the dock doors at 2 in the morning and used a cordless Dewalt recip saw to cut a 3-ft wide hole in the bottom panel of the dock door. They were in after 60 seconds, but they didn't go near electronics. One guy crawled through, and grabbed a 6' tall rolling ladder from the backroom and went directly to TSC (probably woke the dead with those squeaky wheels!!) He climbed up through the drop ceiling and over the top of the wall into their damn CASH OFFICE. Apparently the wall from there to TSC was only a partition and was only about a foot taller than the drop ceiling. Who knew?!
They cleaned that store out really well, and it happened early on a Monday morning after a busy holiday weekend. They didn't set a single alarm off until they left. One alarm triggered when the guy let himself out through the cash office door, and then the perimiter alarm went off when he left the building about 10 seconds later. The second perp had pulled the van around front by the overnight door to TSC, and when the guy inside came out of the cash office, he hit the TSC door buzzer and the driver held the door open for him. They were in and out in less than 15 minutes total. The alarms went off for less than a minute before they hit the road out of town. No plates visible on the van, either.
I always suspected an inside job, and I doubt it was a concidence that the alarm sensors on that store's dock plates apparently never worked from what I was told. They were due for a remodel and a new alarm system in a few months. Sounds like somebody took advantage of an opportunity before that huge security flaw was fixed. Very shady!!
As far as I know, there were never any arrests made in that one.