I have been doing a lot of reading (unfortunately) about human decomposition to try to nail down an idea in my head about when, or if Gannon was placed in a suitcase and whether anyone would have noticed. If he was kept in a storage trailer for any amount of time, and there was ANYONE accessing the inside to help LS “move”, I HIGHLY doubt that after being deceased 3-4 day, nobody noticed.
Here are two sources. One goes extremely in depth and gives incredibly unpleasant details, while the other is more friendly and has less details, but elaborates on the stages using days deceased.
5 Stages of Human Decomposition | Bio Socal
Stage 1 – Initial Breakdown
As soon as death occurs, the body temperature starts cooling to match the surrounding temperature around it. Without blood and oxygen flow, muscular tissues become rigid and the blood pools into the lower extremities. Then, as the bacteria in the intestines devour the intestinal walls, cells lose their structural integrity and cellular enzymes are released to begin breaking down the cells themselves and surrounding tissues. Microbes also start breaking down carbohydrates, proteins, and lipids. Most of this breakdown occurs inside the body and is not visible from the outside. At the end of this stage, blowflies and flesh flies arrive to lay eggs.
Stage 2 – Bloating
As bacteria multiply and process bodily materials, they produce gasses such as methane, carbon dioxide, nitrogen, and hydrogen sulfide which bloat the body. These gasses build up pressure in the body and push fluids out through natural openings including the mouth, nose, and anus. If insects are present, maggots begin to hatch and feed on body tissues causing the skin to slip, the hair to detach, and the surface to rupture. These additional openings provide even more surface area for insects and bacteria, thereby quickening the decaying process. This emitting of gasses and fluids is what causes the greatest amount of
odor during the decaying process.
Stage 3 – Active Decay
It’s during the active decaying process the most body mass is lost due to bacteria and insects processing the body material along with liquids being released into the surrounding environment. During this stage, the area of decomposition expands into the surroundings and the most insects are present while they feed on bodily fluids. This stage ends when the maggots leave the body.
Stage 4 – Advanced Decay
By this stage, most soft tissues have already decomposed and only bones, hair, cartilage, ligaments, and sticky byproducts of decomposition are left. Insects with chewing mouthparts such as beetles and certain types of flies are attracted at this stage and arrive to chew on and process this tougher material.
Stage 5 – Dry Remains
The last stage is when all byproducts of decomposition have dried up and only the skeleton and perhaps some hair are left. Beetles and flies eat anything softer that remains, and mites and moth larvae digest the hair. Exposed to the elements, the bones lighten in color and are eventually reclaimed by the earth.
Speed of Decomposition
How quickly a body decomposes depends on several factors: surrounding temperature, whether the body is buried or exposed to air or water, and the number of bacteria present. A body that is exposed to the elements such as air and water will decompose faster and have more insect activity than a body buried or confined in a sealed space. In similar fashion, a body decomposing in warm temperatures will break down faster than if it is left in a cold environment. The exception to this is if the temperature is so hot that moisture, a needed component in decay, isn’t present. In that case, the body mummifies and dries out.
However fast or slow a body decomposes and goes through these five stages, it is nature’s way of releasing the materials back into the earth so new life can be born again.
https://www.aftermath.com/content/human-decomposition/
- 24-72 hours after death — the internal organs decompose.
- 3-5 days after death — the body starts to bloat and [URL='http://www.enkivillage.com/how-long-does-it-take-for-a-body-to-decompose.html']blood-containing foam
- leaks from the mouth and nose.
- 8-10 days after death — the body turns from green to red as the blood decomposes and the organs in the abdomen accumulate gas.
- Several weeks after death — nails and teeth fall out.
- 1 month after death — the body starts to liquify.
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And then there’s a whole succession of horrible things that ensues. So if I had to take a guess, I’d say this was done almost immediately after that monster took poor Gannon's last breath away from him. 
