Bicycle detail

I was parked at the Residence Inn Pittsburgh North Shore where I was staying. My bike was in the bed of my pickup truck but my bed is covered by a truck topper and window. I rarely lock the topper because my bed itself is always locked (can't open the tailgate). The thieves must have somehow squeezed out between the area of the topper and tail. It was likely done during one of the first two nights i stayed at the hotel (I noticed on day 3 when I went to ride at Frick park).