Blackie.....Are you doing burns all day? That raspberry preserves, sugar, raspberry tea or punch burn was great for me. I'd get some of that Capri Sun and splash around on the trees and logs. I haven't been doing this long, but If he hasn't been around for awhile he may just be a big boar that is going around his home range and hitting the food spots. One book said that a boars home range can be upwards of 40 square miles. Hopefully he's not sitting in someone elses' freezer. Other than getting some unbelievable scents into the air & woods it may just be a patience thing until he gets back to your site. Are you doing all you can with scent mgmt. and movement? Could he have seen you or your daughter and abandoned the site?
If you're not doing burns....HotMoon had talked about 6 hour or more sterno.....I couldn't find it by me but he said to try camping stores.....maybe this would help so you could keep it going longer......also, I did two burns, one down at my site up in a tree and the other up in a tree next to my stand......I could feed it throughout the day when the sterno went out.....more ideas.
When placing a trail camera don't just look for a well used trail. What you want to do is look for a freshly used trail off by itself that goes from a north facing ridge, thick forest, brushy knob or some other similar bedding area to a food source. Don't forget water sources. Especially in the summer months the deer need water so look for a good trail going down too a creek surrounded by thick cover and place the camera 100 yards up from the water source.
Scent control is very important...