I did that once with my pistol box. I had backed into the parking lot and when I left I thought I had everything, Wrong! Sped back out the 25 miles to the range (public) and there it was right here I had left it. It's a conservation range but during the week it's not much used during working hours, so I got very lucky. Now I always pull in so that when I'm leaving I can scan the shooting areas, (just in case).
Also, I'm still wondering where the sights I took of a M70 are, I'd like to put them back on.