Doesn't look like the blanket did a very good job of containing it w/ the size of the hole in the floor.
My bet is that straps that go to the bell housing bolts were too long or not installed allowing the blanket to slide rearward. Doug
Probably so. Or if it was a Lofgren Blanket, which only has 2 straps that wrap around/under the trans, the straps were either damaged or the transmission broke apart so there was nothing for it to hold onto.