Doesn't look much like silver. Not heavy like sugar maple. It was free and less than 5 miles away. Most of it already bucked
Thats only a little more than 1/3 of it. Its too wet to get the rest now. Where does Japanese maple come in on firewood rank? Can't find much info.
The leaf and bark say silver maple to me. Your leaf picture looks to be a young leaf that just recently come out.
It could be silver it was just cut a few days ago and its its somewhat lightweight. The redish hue to the bark threw me off