The ornamental design for a boxspringencasement, as shown and described.
FIG. 1 is a perspective view of a top side of a box spring encasement according to my new design;
FIG. 2 is a perspective view of a bottom side of a box spring encasement, showing my new design;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a side view thereof;
FIG. 8 is a side view thereof from a side opposite that of FIG. 7; and,
FIG. 9 is an enhanced perspective view of the callout 9 of FIG. 1.
The differences in shading represent contrasting surfaces.
The first type of shading of the box spring encasement denotes a first fabric used for a central portion of the box spring encasement and the second type of shading denotes a second type fabric used for a peripheral portion of the box spring encasement wherein the first fabric and second fabric are different.
The broken line showing of the box spring encasement is for environmental purposes only and forms no part of the claimed design