User blog comment:HowtobeaGrimm/Where are the keys?/@comment-26976525-20151008222142

Aunt Marie's key looks like it's made of  tarnished silver. A key "slips" into a lock. Therefore Aunt Marie's key is a "silver slipper."

Nick has a second key from Rolek Porter. Therefore he has a "pair of sliver slippers."

In the book Wizard of Oz by Frank Baum, Dorothy wears  a pair of silver slippers. (It was changed in the movie to ruby slippers because it filmed better.)   At the end of the book, Dorothy has still not found a way home so she goes to the good witch of the South ,Glinda who tells her how to use the silver slippers.

I have thought all along that Rosalee will become Glinda when the time is right.

Dorothy Gale = Nick Burkhardt

Toto = Monroe

Auntie Em = Juliette Silverton

Glinda, the Good Witch = Rosalee

The farm house that gets moved by the cyclone = Aunt Marie's "mobile home" trailer

In Pilot there is a shot of a weather vane on top of a house. And lightening flashes in the sky as Renard and Adalind drive away. I think these are all symbols that "a storm is coming. "  A symbol of the cyclone in the Wizard of Oz.

I'm glad Rosalee has the keys safely hidden away.