This is very difficult. I have been sniping a MIJ LP every now and then for years and most of the time I come back to the specialists posting pictures *after* I get them.
In general you can use these:
- no flame maple
- no hollow top, of course
- fret edge binding is a good indicator but it disappears on refrets
Do not be afraid of the 1990ties but be aware that Burny etc. are not necessarily made in Japan as they get younger.
My person shortcut rule is that if the thing has an ABR-1 bridge I am inclined to buy it and sort it out later.
It's a bit like a lottery.