want to know if the purse was a plant?--did they measure the amount of moisture in the purse, were papers in the purse wet? what was the temperature of the purse---if it had been sitting there for 8hrs ina 40degree damp whether condition, in grass, it would be obvious that it had been there all night (given you might not be able to guess when exactly it was left there, except by running a number of experiments, but you should be able to get close).
did the guy who found the purse go through it? did they look into him a bit?
right now i feel like someone is trying to hand me a big pile sh8 and tell me to analyze how it turned into chocolate cake, when my nose says its not chocolate cake!