Based on the book "Do androids dream of electric sheep?" (1968) by Philip K Dick, the movie "Bladerunner" was set in a post-nuclear world where replicants were indistinguishable from humans. The replicants were used for all the distasteful or dangerous activities on the off-world colonies, and prohibited from Earth. Replicants found on Earth were subject to immediate "retirement" by Bladerunners.
Resuming the storyline of the book for this cache, Deckard, a Bladerunner working in San Fransisco has just encountered the replicant Luba Luft, posing as an opera singer. [In the movie, this scene was replaced by Deckard's encounter with Zhora, the exotic snake dancer.] She distracts him and calls the police who arrest him on suspicion of being suspicious. He is taken to "a" police station for processing. Taking off in the police hovercar he realises they are going the wrong way:
Deckard: "The Hall of Justice...is north, on Lombard"
Police Officer: "That's the old Hall of Justice. The new one is on Mission. That old building, it's disintegrating: it's a ruin. Nobody's used that for years. Has it been that long since you last got booked?"
Deckard rapidly realises he has been busted by the replicants, and he is not going to make it to the next cache. The replicants have not just made it back to Earth, they have created an entire network to protect themselves.
After being booked for three offences that would make a great puzzle cache clue, he meets another Bladerunner by the name of Phil Resch. They realise Resch's boss Inspector Garland is a target on Deckard's list of replicants. Garland also tells Deckard that Resch is a replicant as well but doesn't realise it. Resch claims to be human on account of his owning and caring for a pet squirrel. Only humans can really care about another living creature, can't they?
Deckard tests himself with his own Voight-Kampff machine but starts to question his own existence... Do androids dream of electric sheep?
The twists in the parallel realities get quite tangled at this point. Most of this is lost in the movie unfortunately.
Finding the cache shouldn't be a problem. Avoiding replicants might be harder. Bring your climbing gear too, (for the adjacent business). Please rehide carefully - it can be tucked under the leaf litter in the tree, out of sight of the carpark.