File Cabinet

Dad opened the filing cabinet with the key found in the realtor lock.

Contents
Inside, he found Each folder had a single piece of paper with one word written on it:
 * A pile of bills: one $1, one $2, one $10, and one $20.
 * 7 folders, numbered 2-8.
 * 2 — OWN
 * 3 — THEY
 * 4 — GET
 * 5 — FEARS
 * 6 — OUR
 * 7 — MAKE
 * 8 — SAID

Theories
Shin's squadalaah figured out that the Folder words (own, they, get, fears, our, make, said) fall under the upper left corner of the cutout card obtained from the shops listed on Foursquare when you've placed it in the right spot. See Reddit link: https://www.reddit.com/r/holidaybullshit/comments/3wv6s0/all_the_cutout_cards_and_solutions_in_one_place/