When we talked to the police after some break-ins in the area they said the pattern is random, but the thieves apparently go in by the sliders. There are several ways to secure these, additional locks, and devices placed in the TOP tracks to stop the sliders from being lifted out. I wrote the attached article to show one approach and also the additional locks.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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