"Kit's Pad," by David Krugler, in Ellery Queen Mystery Magazine, November/December 2023.
Kit's life went to hell two years ago and he has been homeless in Chicago ever since. One freezing day he figures out a way to break into a mansion which is empty and for sale. The perfect place to get a warm night's sleep!
It turns out to not be so easy. Every night someone new shows up, searching for a hard drive the absentee owner possibly hid in the building.
What's on the drive? Who are all the people who want it? And, most important, where the heck is it?
A fun story.