Walmart vs Cracker Barrel for overnight stops off I 95

Have stayed at the Walmart at the airport exit several times. First time we stayed I just pulled in and found space to park. Got up next morning had sticker on door I was illegally parked and license number reported but didn't say who it was put on by. Ask manger next time and they said park on side next to Lowes but not on Lowe's property. Later found out it was the man sweeping parking lot that put sticker on. Had same thing happen when parked across street near panera bread store.