The design is the features of shape, configuration and ornament of the business card case as shown in solid lines in the drawings. In Figure 11, business cards in stippled lines, which do not form part of the design, have been included to show the environment of the design. In the first and second variants of the design, the card pockets of the business card case are opaque. In the third and fourth variants of the design, the card pockets of the business card case are transparent.Drawings of the design are included.FIG. 1 is a perspective view of a business card case in open position showing a first variant of the design;FIG. 2 is a perspective view of the business card case of FIG. 1 in closed position;FIG. 3 is a front view of the business card case of FIG. 1 in open position, the back view being identical to the view shown;FIG. 4 is a front view of the business card case of FIG. 1 in closed position, the back view being identical to the view shown;FIG. 5 is a right side view of the business card case of FIG. 1 in open position, the left side view being identical to the view shown;FIG. 6 is a right side view of the business card case of FIG. 1 in closed position, the left side view being identical to the view shown;FIG. 7 is a top view of the business card case of FIG. 1 in open position;FIG. 8 is a top view of the business card case of FIG. 1 in closed position;FIG. 9 is a bottom view of the business card case of FIG. 1 in open position;FIG. 10 is a bottom view of the business card case of FIG. 1 in closed position;FIG. 11 is a perspective view of the business card case of FIG. 1 in open position;FIG. 12 is a perspective view of a business card case in open position, showing a second variant of the design;FIG. 13 is a perspective view of the business card case of FIG. 12 in closed position;FIG. 14 is a front view of the business card case of FIG. 12 in open position, the back view being identical to the view shown;FIG. 15 is a front view of the business card case of FIG. 12 in closed position, the back view being identical to the view shown;FIG. 16 is a right side view of the business card case of FIG. 12 in open position, the left side view being identical to the view shown;FIG. 17 is a right side view of the business card case of FIG. 12 in closed position, the left side view being identical to the view shown;FIG. 18 is a top view of the business card case of FIG. 12 in open position;FIG. 19 is a top view of the business card case of FIG. 12 in closed position;FIG. 20 is a bottom view of the business card case of FIG. 12 in open position;FIG. 21 is a bottom view of the business card case of FIG. 12 in closed position;FIG. 22 is a perspective view of a business card case in open position, showing a third variant of the design;FIG. 23 is a perspective view of the business card case of FIG. 22 in closed position;FIG. 24 is a front view of the business card case of FIG. 22 in open position, the back view being identical to the view shown;FIG. 25 is a front view of the business card case of FIG. 22 in closed position, the back view being identical to the view shown;FIG. 26 is a right side view of the business card case of FIG. 22 in open position, the left side view being identical to the view shown;FIG. 27 is a right side view of the business card case of FIG. 22 in closed position, the left side view being identical to the view shown;FIG. 28 is a top view of the business card case of FIG. 22 in open position;FIG. 29 is a top view of the business card case of FIG. 22 in closed position;FIG. 30 is a bottom view of the business card case of FIG. 22 in open position;FIG. 31 is a bottom view of the business card case of FIG. 22 in closed position;FIG. 32 is a perspective view of a business card case in open position, showing a fourth variant of the design;FIG. 33 is a perspective view of the business card case of FIG. 32 in closed position;FIG. 34 is a front view of the business card case of FIG. 32 in open position, the back view being identical to the view shown;FIG. 35 is a front view of the business card case of FIG. 32 in closed position, the back view being identical to the view shown;FIG. 36 is a right side view of the business card case of FIG. 32 in open position, the left side view being identical to the view shown;FIG. 37 is a right side view of the business card case of FIG. 32 in closed position, the left side view being identical to the view shown;FIG. 38 is a top view of the business card case of FIG. 32 in open position;FIG. 39 is a top view of the business card case of FIG. 32 in closed position;FIG. 40 is a bottom view of the business card case of FIG. 32 in open position; andFIG. 41 is a bottom view of the business card case of FIG. 32 in closed position.