Assume that a lawyer wants to prove that the mail carrier left mail in the mailbox at 67 Dressel Avenue. She calls the following witnesses:

1. Mrs. Baker, who lives at that address, testifies that at 11 a.m., she went to the mailbox, found mail, and brought it into her house.
2. Mr. Baker testifies that he checked the mailbox when he left for work at 9 a.m., and it was empty.
3. Mrs. Brown, a next-door neighbor, testifies at 9:30 a.m., she saw two sets of footprints in the snow in the Baker yard. One set led up to the mailbox, and one set led away.
4. Mr. Grimes, who lives across the street, testifies that he saw the mail carrier put mail in the mailbox at 9:15 a.m.
5. Mr. Smith, another neighbor, testifies that he saw the mail carrier put mail in the mailbox but is not sure of the time.
6. Mrs. Williams, a relative of the Bakers, testifies she was walking down the street that morning and saw the mail carrier delivering mail to the house next door.
7. Ms. Murray testifies he left the post office at 8 a.m. with mail for every resident on Dressel Avenue, and that late in the afternoon, he returned with an empty mailbag.

Label each piece of testimony as direct, circumstantial, cumulative, or corroborative and why.