I've just come across this press report from the Star 4th Oct about where the torso was found, and don't remember seeing it posted before. It gives some idea of the layout of the foundations, and also mentions the torso was hidden behind a bit of fence leaning against the wall. If true, then it's no surprise that it might have been missed for a few weeks.
"Towards the Thames front of the site there are some underground steps. These steps lead to a door at a lower depth. An inclined plane leads to a lower level. This lower level is a vast place of arches, from which the light is partially excluded by the walls for the floors above, and is in constant shade. In one place there is a deep recess, in which, even when the sun is shining brightly outside, there is complete darkness. This leads by a dangerous way to another recess. In one corner of this furthest dark recess stands a piece of hoarding, two pieces of board held together by a cross piece, as if it had formed once part of a builder's hoarding round the building. This stands crossways against the wall, leaving a triangular space. It was within this space that the parcel containing the body was found. The devious ways which have to be taken to reach this secret spot, and the fact that this is the most secret spot on the site, lead to the conclusion that the person who placed the remains there must have been well acquainted with the place, and the deposit must have been made in the day."
Also in the same article is an intriguing suggestion;
"The body was in a condition which showed that a vain endeavor had been made to arrest putrefaction, and the idea in bringing it to the Thames Embankment was probably to cast it into the Thames, and it would most likely have been cast there three weeks ago but for the prompt discovery of the arm and the vigilance observed in all parts of the river. It is thought possible that the bundle was conveyed by the carts which enter at the side of the building and deliver materials. It is remarkable that the severed arm was found near a wharf whence wood for building is carted to places where building is being carried on."
"Towards the Thames front of the site there are some underground steps. These steps lead to a door at a lower depth. An inclined plane leads to a lower level. This lower level is a vast place of arches, from which the light is partially excluded by the walls for the floors above, and is in constant shade. In one place there is a deep recess, in which, even when the sun is shining brightly outside, there is complete darkness. This leads by a dangerous way to another recess. In one corner of this furthest dark recess stands a piece of hoarding, two pieces of board held together by a cross piece, as if it had formed once part of a builder's hoarding round the building. This stands crossways against the wall, leaving a triangular space. It was within this space that the parcel containing the body was found. The devious ways which have to be taken to reach this secret spot, and the fact that this is the most secret spot on the site, lead to the conclusion that the person who placed the remains there must have been well acquainted with the place, and the deposit must have been made in the day."
Also in the same article is an intriguing suggestion;
"The body was in a condition which showed that a vain endeavor had been made to arrest putrefaction, and the idea in bringing it to the Thames Embankment was probably to cast it into the Thames, and it would most likely have been cast there three weeks ago but for the prompt discovery of the arm and the vigilance observed in all parts of the river. It is thought possible that the bundle was conveyed by the carts which enter at the side of the building and deliver materials. It is remarkable that the severed arm was found near a wharf whence wood for building is carted to places where building is being carried on."
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