These tiles are in the ceiling on part of a basement. It is impossible to say when they were installed, and to me, they appear to be a more modern, cellulose tile? They are intact, painted, and this picture is the only place where they have been disturbed, presumably to access something, or when someone decided to look. The home is an estate sale, and there is no disclosure from the family. Any clues? I know the best answer is to have them tested, but I thought perhaps a visual could serve as a clue...

HOW DO I UPLOAD A PICTURE? IT KEEPS TELLING ME THAT MY .JPG PIC IS NOT A VALID IMAGE FILE. IT IS SMALLER THAN THE MAXIMUM ALLOWED.

This thread is useless with no picture. Just can't load it...