Reminds me, I lost track of my GM-E1 last night. Cleaning out my Dodge Dakota around 9pm, I threw out a large shopping bag full of trash that was in the back seat of my truck. Well, it turns out that I got back in the house, cleaned out my pockets, and no E1! So I freaked out, thinking it was in one of the trash bags. Looked through them, no dice, looked outside in the grass near my truck, no dice. Went to sleep, get up to go to work, go back out in truck and in one last desperate plea, I lifted up the rear fold-up bench seat and saw my light buried under my jumper cables. WHEW! It must have fallen out when I crouched over the front seat.
I hope your Arc4+ turns up soon!