Tim Schwartz examined the warning triangle and had the following to say:
"This part is not GM. It is a triangle in a gray plastic case and it does have a car emblem in the center, but it is an early open touring car, not a Fisher Body coach.
The only markings on it are (in no special order):
JLleart (this is stylized, and probably the manufacturer's logo)
APP. REG. SF-H IV-6703
That's all folks! No other markings at all, including on the case."