The memory is hazy since it was 15+ years ago, but I'm fairly sure I knew someone who worked at a company whose servers were stolen this way.
The thieves had access to the office building but not the server room. They realized the server room shared a wall with a room that they did have access to, so they just used a sawzall to make an additional entrance.
my across the street neighbor had some expensive bikes stolen this way. The thieves just cut a hole in the side of their garage from the alley, security cameras were facing the driveway and with nothing on the alley side. We (the neighborhood) think they were targeted specifically for the bikes as nothing else was stolen and your average crack head isn't going to make that level of effort.
The thieves had access to the office building but not the server room. They realized the server room shared a wall with a room that they did have access to, so they just used a sawzall to make an additional entrance.