Yes, I think that the tools were just thrown under the seat, as Jimmy D suggested - these were trucks and those were non-professional tools. Do you think that the bottle jack, jack handle, and wheel-lug wrench had their own special tool box/bog? I do not know for sure, but my guess in no box/bag (except for the small tools).

Also, it should be noted that sometime in 1949, all tools except for jack and wheel wrench, were discontinued.

Do you wonder why so few of those tools remain in the trucks 50-60 years later?