The ornamental design for a mini-chair wireless device holder, as shown and described.
FIG. 1 is an orthographic view of the mini-chair wireless device holder showing my new design, the figures shows a wireless device prior to being inserted into the mini-chair.
FIG. 2 is an orthographic front view thereof, showing a wireless device inserted into the mini-chair.
FIG. 3 is an elevational front view thereof;
FIG. 4 is an elevational rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is a left side elevational view thereof.
The wireless device shown in broken line depicts environmental subject matter only and forms no part of the claimed design.