A method of making a vacuum insulated refrigerator cabinet structure, the method comprising: thermoforming a first thermoplastic polymer sheet to form a wrapper having a base wall and four sidewalls (22A, 22B, 22C, 22D) having inner and outer sides and extending transversely from the base wall to form four elongated inside corners and a main opening; thermoforming a second thermoplastic polymer sheet to form a liner having a base wall and four sidewalls (68A, 68B, 68C, 68D) having inner and outer sides and extending transversely from the base wall, wherein each sidewall (68A, 68B, 68C, 68D) includes a free edge (80A, 80B, 80C, 80D) opposite the base wall forming a main opening; adhesively securing an elongated corner stiffener (40A, 40B, 40C, 40D) to each elongated inside corner of the wrapper, wherein each elongated corner stiffener (40A, 40B, 40C, 40D) includes an opening (42A, 42B, 42C, 42D); securing a resilient ring to the liner adjacent to the free edges (80A, 80B, 80C, 80D) of the sidewalls (68A, 68B, 68C, 68D), the resilient ring including four corners and wherein each corner includes a pin (86A, 86B, 86C, 86D) projecting from the corner; positioning the liner inside the wrapper to form a cavity between the wrapper and the liner, wherein the pins (86A, 86B, 86C, 86D) of the resilient ring are received in the openings (42A, 42B, 42C, 42D) of the elongated corner stiffeners (40A, 40B, 40C, 40D), and wherein the resilient ring extends between the inner sides of the wrapper sidewalls (22A, 22B, 22C, 22D) and the outer sidewalls (68A, 68B, 68C, 68D) of the liner to seal the cavity; adhesively sealing the resilient ring to the wrapper and to the liner; causing porous material to be disposed in the cavity between the wrapper and the liner; forming a vacuum in the cavity; and sealing the cavity to maintain the vacuum. thermoforming a first thermoplastic polymer sheet to form a wrapper having a base wall and four sidewalls (22A, 22B, 22C, 22D) having inner and outer sides and extending transversely from the base wall to form four elongated inside corners and a main opening; thermoforming a second thermoplastic polymer sheet to form a liner having a base wall and four sidewalls (68A, 68B, 68C, 68D) having inner and outer sides and extending transversely from the base wall, wherein each sidewall (68A, 68B, 68C, 68D) includes a free edge (80A, 80B, 80C, 80D) opposite the base wall forming a main opening; adhesively securing an elongated corner stiffener (40A, 40B, 40C, 40D) to each elongated inside corner of the wrapper, wherein each elongated corner stiffener (40A, 40B, 40C, 40D) includes an opening (42A, 42B, 42C, 42D); securing a resilient ring to the liner adjacent to the free edges (80A, 80B, 80C, 80D) of the sidewalls (68A, 68B, 68C, 68D), the resilient ring including four corners and wherein each corner includes a pin (86A, 86B, 86C, 86D) projecting from the corner; positioning the liner inside the wrapper to form a cavity between the wrapper and the liner, wherein the pins (86A, 86B, 86C, 86D) of the resilient ring are received in the openings (42A, 42B, 42C, 42D) of the elongated corner stiffeners (40A, 40B, 40C, 40D), and wherein the resilient ring extends between the inner sides of the wrapper sidewalls (22A, 22B, 22C, 22D) and the outer sidewalls (68A, 68B, 68C, 68D) of the liner to seal the cavity; adhesively sealing the resilient ring to the wrapper and to the liner; causing porous material to be disposed in the cavity between the wrapper and the liner; forming a vacuum in the cavity; and sealing the cavity to maintain the vacuum.