The ornamental design for a case, as shown and described.
FIG. 1 is a top front perspective view of the case showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a top elevation view thereof;
FIG. 7 is a bottom elevation view thereof;
FIG. 8 is a top front perspective view thereof in an open arrangement where the arrows represent motion of the points; and,
FIG. 9 is a top front perspective view in an open arrangement in an alternate state of use, where the evenly broken lines represent alignment and form no part of the claimed design.
The broken lines shown in the drawings illustrate portions of the case that form no part of the claimed design.