I at least had four other incidents of people stealing my work. I agreed to allow one of my originally-designed blackwork roosters be shown at a charity show, and while nobody was looking, somebody stole the pillow I'd worked to help sell patterns before I had it photographed to put on a pattern envelope to sell. The charity group was "very sorry" about it. Another Senior benefit group organizer came to my shop one day a few years later and requested that I let her hang one of my original quilts in the lobby at an old folks home. I agreed they could hang it for 3 months. Three months later, nobody returned my quilt. Six months later, I called the home and asked for my quilt back and asked to talk to the activities coordinator. She had quit her job and left town. Nobody knew nothin' about my quilt. A few years later, I'd sorta forgotten about these lessons in life when a local art gallery contacted me about their new discovery center in the museum, and since quilts were geometric, would I care to show a few items of mine that showed geometry in quilts. I was flattered, and they promised to send customers my way. I released geometric items in progress which could be handled for proof I had used geometric templates; others formed by simply using pins; a Kaleidoscope quilt I had painstakingly designed to be different from other Kaleidoscope quilts for hastily-made quilts, and another geometric quilt that also took 3 months of slave labor to construct, quilt, and bind, all using straight-line and curved work that could have come straight out of a Pathagorean theorem illustration book. 4 months later, after the "exhibit," I contacted the museum about the whereabouts of my 4 works for their display. They said they'd get back to me. I called them a year later, and they were irate at this point that I would dare bother them about something that happened so long ago.
While I wasn't making any money, I got cheated out of about $4,000 worth of artworks in my enthusiasm for helping out other people, and another $200 in book sales to a school, since I would have given a printing-costs-only price to the schools where my children went to school.
You have to be careful with your original works of art. If you don't copyright your months of work and labor, the least likeliest people are easiest for thieves to target, or they just don't empathize with your lack of funds when the expropriate your ideas, your original designs, and your original works.