Excellent guess, Eva, but that is not what I am thinking of.
Hint #1: Also found during the excavation were:
fragments of ceramic dishes, jugs and vases
tiny wine goblets
perfume bottles and medicine jars
machine-cut nails
shoes
painted horsehair-covered plaster
mica sheets possibly used for window panes
children's ceramic marbles
broken pencil stubs
tobacco pipe bowls and stems
straight pins, needles and buttons
a lady's haircomb