The trash can is where things go once they are no longer wanted, so it is read as rejection, letting go or deciding what has no place in life. Searching through one points to looking for something discarded too soon.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.