I had an Aunt who knew how to date Old Brick, meaning that she knew how to determine the age of bricks made of clay. My parents had a fireplace made in their living room, with a ledge around it, made from 'antique bricks'. So the Aunt comes to visit, takes a look at the ledge, takes more time to study the bricks and says: Oh my, that stone dates from around the year 1450! (Dear reader, we're in Europe here.)
She also explained why that was so, and I wish I'd remember more... what I do remember is that the specific size of the brick is one of the factors.
There are some rumours out there on the internet that the Old Man and his Old Bricks do not exist and that David made them up for a reason. IMHO the one thing that CONFIRMS David's story is that he had some of those bricks with him.
Here's what I would do. I would take the bricks to the History Department at the University, or to the FBI. Let them determine the age of the bricks. Let them determine everything they can. Once you know the age, and maybe the origin, study old maps and census records. Mind you, if the bricks were of good quality, they may have been used again, just like the bricks in my parents' fireplace ~ those did not come directly from a building from 1450 either.
So those bricks might have been recycled, but they would not have travelled far.
That is how I would do it.
:bricks: :lookingitup: