of a moldable plastic material such as lexan and are preferably vacuum formed to their respective shapes as shown in fig1 front member 22 has the general shape of a shallow rectangular tub having a planar front surface 30 and a peripheral lip formed by a slanted top surface 32 a slanted bottom surface 34 a slanted right side surface 36 and a slanted left side surface 38 the outside front surface of front member 22 preferably has a roughened scratch resistant finish referring to fig2 and 4 back member 24 has a back planar surface 40 a top perpendicular surface 42 a top parallel surface 44 a bottom perpendicular surface 46 a bottom parallel surface 38 a right side perpendicular surface 50 a right side parallel surface 52 a left side perpendicular surface 54 and a left side parallel surface 56 an extended portion 60 of back planar surface 24 is provided with a securing member 62 such as the plate for a magnetic catch or a portion of a mechanical latch the perpendicular surfaces 42 46 50 and 54 form a peripheral lip the parallel surfaces 44 48 52 and 56 form a peripheral flange around the back member which corresponds to the peripheral area of front surface 30 so that the back member 24 may be placed within the front member 22 and secured to it by means such as an adhesive 68 double sided tape glue cement velcro or a mechanical fastener it.