Mysteries Wrapped in Enigmas, etc.

OK, I was able to do some investigating.  Something did hit the door.  I'm not imagining things, as "he" suggests.  Nor will I shut up already, as "she" demands.

Here's what I found.  That's right.  A crumpled up map of London shown above.

Inside was a crumpled up sheet of paper with a bunch of mathematical symbols and stuff.  It was all covered with some kind of goo, but this is it when I was able to clean it up.  Many of the formulae seem to be attempts to retrieve the values "j", "b", and "e".

Finally, there is an origami figure of a snail.  Again with the snails.

What to make of it?  Listen, I'm only a five year old puppy.  I can't even read.  This is too much.

I think the whole thing was folded around some sort of stone, which I was unable to recover.  I suspect this stone contains the clue to the entire mystery.  Or maybe it is just a stone.  How should I know.  I'm only a five year old puppy, blah, blah, blah...

Where is my Jujube?