Bicycle detail

At approx. 1400 on the said date, I departed the upper parking area at the Military Reserve after mountain biking. While I don't remember specifically loading my bike up, I would have ran over or otherwise hit my bike if as I was backing up. As such, I assume that It was loaded.I arrived at Madison Ave in Boise at approx. 1415 and parked approx. 100 feet to the east of my residence(2115 Madison Ave) which was out of site of the front of my residence. After parking, I entered my residence and was on my computer working on my resume until approx. 1745, at which point I went back out to my vehicle to go to Meridian to visit my girlfriend. It was after this point that I realized that my bike was no longer in the back of my truck.