When I visit Big Brother and get the Black Glass as part of the Mom quest, I get debug logs produced. This has happened in the last two times I've done the quest, most recently in 12062.
From the CLI :
Unexpected error, debug log printed.
Unknown item found: black glass (6398, 201304219)
--------------------
6398 black glass 201304219 blackglass.gif accessory q 0
black glass 0 none
# black glass
--------------------
You acquire an item: black glass
You acquire sand dollar (13)
Unexpected error, debug log printed.
Debug log attached.
From the CLI :
Unexpected error, debug log printed.
Unknown item found: black glass (6398, 201304219)
--------------------
6398 black glass 201304219 blackglass.gif accessory q 0
black glass 0 none
# black glass
--------------------
You acquire an item: black glass
You acquire sand dollar (13)
Unexpected error, debug log printed.
Debug log attached.
