The ornamental design for a displaycontainer with interior mount, as shown and described.
FIG. 1 is a perspective view of a display container with interior mount showing my new design;
FIG. 2 is a front view of the display container with interior mount of FIG. 1;
FIG. 3 is a rear view of the display container with interior mount of FIG. 1;
FIG. 4 is a left side view of the display container with interior mount of FIG. 1;
FIG. 5 is a right side view of the display container with interior mount of FIG. 1;
FIG. 6 is a top plan view of the display container with interior mount of FIG. 1; and,
FIG. 7 is a bottom plan view of the display container with interior mount of FIG. 1.
The portions of the display container with interior mount shown in broken lines are for environmental purposes only and do not form part of the claimed design.