What objects were used more than once

Hint 1 of 5:

Crackers: feed Poly every hour!

Hint 2 of 5:

Crowbar:  in the chapel and in the tomb.

Hint 3 of 5:

Diary:    read it and use monocle on it.

Hint 4 of 5:

Oilcan:   lube the old bell and the suit of armor

Hint 5 of 5:

Monocle:  use it to check almost everything!